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Full vulnerability report · 2026
CVE-2026-42534High confidence

Jostle logic bypass degrades resolution performance

NLnet Labs · Unbound

6.9MediumCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.72% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs NLnet Labs Unbound and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

7 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainunboundVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.1.25.2-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainunboundVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.1.25.2-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceunboundVendor fix publishedDebian records a fixed source-package version for this release.1.22.0-2+deb13u3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourceunboundAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourceunboundVendor fix publishedDebian records a fixed source-package version for this release.1.25.1-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourceunboundVendor fix publishedDebian records a fixed source-package version for this release.1.25.1-1Debian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveunboundVendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.1.19.2-1ubuntu3.8Canonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-42534 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityunbound: Unbound: Denial of Service due to degraded resolution performance in jostle logic
12 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • unbound as a component of Red Hat Enterprise Linux 6
  • unbound-devel as a component of Red Hat Enterprise Linux 6
  • unbound-libs as a component of Red Hat Enterprise Linux 6
  • unbound-python as a component of Red Hat Enterprise Linux 6
  • unbound.src as a component of Red Hat Enterprise Linux 6
  • unbound as a component of Red Hat Enterprise Linux 7
  • unbound-devel as a component of Red Hat Enterprise Linux 7
  • unbound-libs as a component of Red Hat Enterprise Linux 7
  • unbound-python as a component of Red Hat Enterprise Linux 7
  • unbound.src as a component of Red Hat Enterprise Linux 7
  • openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4
  • openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
Summary
A flaw was found in Unbound. An adversary who can query a vulnerable Unbound instance and control a slow or malicious domain name server can exploit a vulnerability in the jostle logic. This flaw allows retransmitted queries to renew the age of slow-running queries, preventing them from being identified as aged and replaced. This can degrade Unbound's resolution performance, potentially leading to a denial of resolution service through coordinated attacks.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-31082

No EUVD known-exploited evidence

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
6.9 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.

What

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.

Why

A feature, API, or function does not perform according to its specification.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.

Why

A feature, API, or function does not perform according to its specification.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Expected Behavior Violation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-440 ↗

CWE-440: Expected Behavior Violation. A feature, API, or function does not perform according to its specification.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Amber

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-440
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-31082Official EUVD mapping

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.

Official EUVD record ↗
BSI · German · WID-SEC-2026-2455Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in verschiedenen Komponenten von Drittanbietern in Oracle Solaris ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

Official advisory ↗
BSI · German · WID-SEC-2026-1599Unbound: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Unbound ausnutzen, um einen Denial of Service Zustand herbeizuführen, um möglicherweise Code auszuführen und um nicht näher spezifizierte Auswirkungen zu verursachen.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-016796NLnet Labsのunboundにおける予期せぬ動作に関する脆弱性

NLnet LabsのUnboundバージョン1.25.0以下には、ジョスルロジックに脆弱性が存在し、その目的を無効にして解決性能を低下させる可能性があります。同一クエリの再送は、遅延しているクエリの経過時間を更新してしまい、ジョスルロジックがそれらを古くなった潜在的な置換対象として認識できなくなります。脆弱なUnboundにクエリを送信でき、さらにUnboundのクエリに対して遅延や悪意のある応答を返すドメインネームサーバーを制御できる攻撃者は、この脆弱性を悪用してUnboundの解決性能を低下させることが可能です。Unboundの「num-queries-per-thread」が上限に達すると、ジョスルロジックが発動します。新しいクエリが来ると、解決に時間のかかっている利用可能なクエリの半数が置換候補となります。脆弱性は、解決が必要な重複クエリが解決開始時のオリジナルクエリのタイムスタンプではなく、最新の重複クエリのタイムスタンプを使用して経過時間の判定を歪めることで発生します。キャッシュおよびローカルデータの応答性能には影響がありません。協調攻撃により、解決サービス拒否（DoS）状態に陥る恐れがあります。Unbound 1.25.1には、ジョスルロジックが意図通りに動作するように、着信クエリに対して初期の更新不可の開始時刻を付与する修正パッチが含まれています。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 20 May 2026 · Last source change 1 Sept 2026, 12:04 UTC · CWE-440 · Expected Behavior Violation

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-31082
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    unbound as a component of Red Hat Enterprise Linux 6; unbound-devel as a component of Red Hat Enterprise Linux 6; unbound-libs as a component of Red Hat Enterprise Linux 6; unbound-python as a component of Red Hat Enterprise Linux 6; unbound.src as a component of Red Hat Enterprise Linux 6; unbound as a component of Red Hat Enterprise Linux 7; unbound-devel as a component of Red Hat Enterprise Linux 7; unbound-libs as a component of Red Hat Enterprise Linux 7; unbound-python as a component of Red Hat Enterprise Linux 7; unbound.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: python3-unbound-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.src as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-dracut-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); and 153 more
    After
    unbound as a component of Red Hat Enterprise Linux 6; unbound-devel as a component of Red Hat Enterprise Linux 6; unbound-libs as a component of Red Hat Enterprise Linux 6; unbound-python as a component of Red Hat Enterprise Linux 6; unbound.src as a component of Red Hat Enterprise Linux 6; unbound as a component of Red Hat Enterprise Linux 7; unbound-devel as a component of Red Hat Enterprise Linux 7; unbound-libs as a component of Red Hat Enterprise Linux 7; unbound-python as a component of Red Hat Enterprise Linux 7; unbound.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: python3-unbound-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.src as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-dracut-0:1.24.2-7.el10_2.2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); and 153 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 1.25.1 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Unbound: < 1.25.1 · Fixed: This issue is fixed starting with version 1.25.1
    CNA ↗
  3. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    sep@nlnetlabs.nl ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-31082↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-42534 · cve.blacktree.nl