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Full vulnerability report · 2026
CVE-2026-42959High confidence

Crash during DNSSEC validation of malicious content

NLnet Labs · Unbound

8.7HighCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. 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 severityHighOperational priority:High, 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: Within 30 daysRemediation target: Within 180 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-2026-42959 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityunbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages
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's DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is created that the validator later dereferences, causing an immediate process crash. Any application or infrastructure relying on Unbound for DNS resolution could be forced to exit unexpectedly, resulting in a denial-of-service condition.
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-2026-31084

No EUVD known-exploited evidence

NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

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
8.7 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. 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 denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

What

NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

Why

The product accesses or uses a pointer that has not been initialized.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

Why

The product accesses or uses a pointer that has not been initialized.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

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 → Access of Uninitialized Pointer → disrupt the affected service
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-824 ↗

CWE-824: Access of Uninitialized Pointer. The product accesses or uses a pointer that has not been initialized.

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:H/SC:N/SI:N/SA:N/U:Red

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.VAHighVulnerable-system availability: A successful attack can cause a major 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.
NetworkUnauthenticatedDenial of serviceCWE-824
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-31084Official EUVD mapping

NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

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 ↗
CERT-FR · French · CERTFR-2026-AVI-1111Multiples vulnérabilités dans les produits F5

De multiples vulnérabilités ont été découvertes dans les produits F5. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges et un déni de service à distance.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0986Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-42497 Référence CVE CVE-2026-42498 https://www.cve.org/CVERecord?id=CVE-2026-42498 Référence CVE CVE-2026-42580 https://www.cve.org/CVERecord?id=CVE-2026-42580 Référence CVE CVE-2026-42581 https://www.cve.org/CVERecord?id=CVE-2026-42581 Référence CVE CVE-2026-42583 https://www.cve.org/CVERecord?id=CVE-2026-42583 Référence CVE CVE-2026-42584 https://www.cve.org/CVERecord?id=CVE-2026-42584 Référence CVE CVE-2026-42585 https://www.cve.org/CVERecord?id=CVE-2026-42585 Référence CVE CVE-2026-42587 https://www.cve.org/CVERecord?id=CVE-2026-42587 Référence CVE CVE-2026-42944 https://www.cve.org/CVERecord?id=CVE-2026-42944 Référence CVE CVE-2026-42959 https://www.cve.org/CVERecord?id=CVE-2026-42959 Référence CVE CVE-2026-43020 https://www.cve.org/CVERecord?id=CVE-2026-43020 Référence CVE CVE-2026-43027 https://www.cve.org/CVERecord?id=CVE-2026-43027 Référence CVE CVE-2026-43037 https://www.cve.org/CVERecord?id=CVE-2026-43037 Référence CVE CVE-2026-43038 https://www.cve.org/CVERecord?id=CVE-2026-43038 Référence CVE CVE-2026-43051 https://www.cve.org/CVERecord?id=CVE-2026-43051 Référence CVE CVE-2026-43110 https://www.cve.org/CVERecord?id=CVE-2026-43110 Référence CVE CVE-2026-43125 https://www.cve.org/CVERecord?id=CVE-2026-43125 Référence CVE CVE-2026-43158 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-016793NLnet Labsのunboundにおける初期化されていないポインタのアクセスに関する脆弱性

NLnet Labs の Unbound バージョン 1.25.0 まで（含む）には、DNSSEC バリデータにサービス拒否（DoS）脆弱性が存在し、悪意のある上流の応答によりクラッシュが発生する可能性があります。Unbound が検証用の chase-reply メッセージを構築する際、コードは ADDITIONAL セクションの rrset の書き込みオフセットを計算するために誤ったカウンターを使用します。DNAME の重複は ANSWER セクションのカウントを増加させる可能性があり、authority フィルタリングは AUTHORITY セクションのカウントを減少させて初期化されていない配列スロットを作成する可能性があります。これら二つが組み合わさると、バリデータは後に初期化されていないポインタを逆参照し、即座にプロセスクラッシュを引き起こします。DNSSEC 署名済みドメインを管理する攻撃者は、unsigned CNAME を含む DNAME チェーンを設定し、署名されていない AUTHORITY レコードと署名済みの ADDITIONAL グルーレコードを含む応答を用いることで、このバグを単一のクエリで誘発できます。Unbound 1.25.1 には、適切なカウンターを使用して書き込みオフセットを計算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, 12:05 UTC · CWE-824 · Access of Uninitialized Pointer

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-2026-31084
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_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.src as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-dracut-0:1.24.2-7.el10_2.1.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_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.src as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-debugsource-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); unbound-dracut-0:1.24.2-7.el10_2.1.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-2026-31084↗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-2026-42959 · cve.blacktree.nl