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Full vulnerability report · 2026
CVE-2026-58471High confidence

GNU Wget 1.25.0 Heap Buffer Overflow via convert_fname() in url.c

gnuwget · wget

6.0MediumCVSS 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 4 structured product or package states 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.
  • EPSS is 0.39% 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 gnuwget wget 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 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

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

5 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 4 affected package states 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
Debian trixietrixie · sourcewgetAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcewgetAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcewgetAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcewgetAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivewgetVendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.1.21.4-1ubuntu4.3Canonical 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.

2 current
CVE-2026-58471 · CSAF 2.0 · revision 16 · interimSUSE Product Security TeamCVE-2026-58471
30 known affected

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

  • wget as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • wget as component of SUSE Linux Enterprise High Performance Computing 15 SP2
  • wget as component of SUSE Linux Enterprise High Performance Computing 15 SP3
  • wget as component of SUSE Linux Enterprise Server 15 SP1-LTSS
  • wget as component of SUSE Linux Enterprise Server 15 SP1
  • wget as component of SUSE Linux Enterprise Server 15 SP2-LTSS
  • wget as component of SUSE Linux Enterprise Server 15 SP2
  • wget as component of SUSE Linux Enterprise Server 15 SP3-LTSS
  • wget as component of SUSE Linux Enterprise Server 15 SP3
  • wget as component of SUSE Linux Enterprise Server 15 SP6-LTSS
  • wget as component of SUSE Linux Enterprise Server 15 SP6
  • wget as component of SUSE Linux Enterprise Server for SAP Applications 15 SP1
Summary
GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-58471 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitywget: GNU Wget: Heap buffer overflow via server-supplied filename leads to memory corruption
4 known affected

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

  • wget as a component of Red Hat Enterprise Linux 6
  • wget.src as a component of Red Hat Enterprise Linux 6
  • wget as a component of Red Hat Enterprise Linux 7
  • wget.src as a component of Red Hat Enterprise Linux 7
Summary
A flaw was found in GNU Wget. A remote attacker can exploit a heap buffer overflow vulnerability in the convert_fname() function. This occurs when processing a server-supplied filename that requires character set conversion, leading to memory corruption due to incorrect buffer reallocation. This can result in a denial of service or other impacts.
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-2026-42083

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
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 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.

What

GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path may attempt exploitation when the stated preconditions are met. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path may attempt exploitation when the stated preconditions are met. 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 → Heap-based Buffer Overflow → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Passive interaction required
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-122 ↗

CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIPassiveUser interaction: A user must unknowingly interact with the vulnerable system.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VILowVulnerable-system integrity: A successful attack can cause a limited loss.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.
NetworkUnauthenticatedCWE-122
A

Official authority intelligence

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

BSI · German · WID-SEC-2026-3595IBM QRadar SIEM: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2026-2236wget: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in wget ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260708Security Bulletin 8 July 2026 [PDF, 1MB]]

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 8 July 2026 [PDF, 1MB]], published on 8 July 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1256Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-58014 Référence CVE CVE-2026-58015 https://www.cve.org/CVERecord?id=CVE-2026-58015 Référence CVE CVE-2026-58055 https://www.cve.org/CVERecord?id=CVE-2026-58055 Référence CVE CVE-2026-58059 https://www.cve.org/CVERecord?id=CVE-2026-58059 Référence CVE CVE-2026-58060 https://www.cve.org/CVERecord?id=CVE-2026-58060 Référence CVE CVE-2026-58061 https://www.cve.org/CVERecord?id=CVE-2026-58061 Référence CVE CVE-2026-58062 https://www.cve.org/CVERecord?id=CVE-2026-58062 Référence CVE CVE-2026-58063 https://www.cve.org/CVERecord?id=CVE-2026-58063 Référence CVE CVE-2026-58469 https://www.cve.org/CVERecord?id=CVE-2026-58469 Référence CVE CVE-2026-58471 https://www.cve.org/CVERecord?id=CVE-2026-58471 Référence CVE CVE-2026-58472 https://www.cve.org/CVERecord?id=CVE-2026-58472 Référence CVE CVE-2026-59638 https://www.cve.org/CVERecord?id=CVE-2026-59638 Référence CVE CVE-2026-59639 https://www.cve.org/CVERecord?id=CVE-2026-59639 Référence CVE CVE-2026-59642 https://www.cve.org/CVERecord?id=CVE-2026-59642 Référence CVE CVE-2026-59645 https://www.cve.org/CVERecord?id=CVE-2026-59645 Référence CVE CVE-2026-59646 https://www.cve.org/CVERecord?id=CVE-2026-59646 Référence CVE CVE-2026-59647 https://www.cve.org/CVERecord?id=CVE-2026-59647 Référence CVE CVE-2026-59648 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-023375GNU ProjectのGNU Wgetにおけるヒープベースのバッファオーバーフローの脆弱性

GNU Wget 1.25.0まで（コミット c2640fe で修正済み）には、src/url.c 内の convert_fname() 関数にヒープバッファオーバーフローの脆弱性があります。この脆弱性により、リモートの攻撃者が文字セット変換を必要とするサーバーから提供されたファイル名を通じてメモリ破損を引き起こすことが可能です。iconv の E2BIG 再割り当て処理時に出力バッファが小さすぎる場合、再割り当てロジックが残りの空き容量を誤って計算し、その結果ヒープバッファオーバーフローが発生します。これにより、悪意を持って細工されたサーバー応答を介して攻撃が実行される可能性があります。

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
wget: c2640fe5171c59f87c58dc9fcb195b2d18b010ee
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
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 7 Jul 2026 · Last source change 14 Jul 2026, 22:03 UTC · CWE-122 · Heap-based Buffer Overflow

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-2026-42083
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD enriched

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
    wget.src as a component of Red Hat Enterprise Linux 10; wget as a component of Red Hat Enterprise Linux 6; wget.src as a component of Red Hat Enterprise Linux 6; wget as a component of Red Hat Enterprise Linux 7; wget.src as a component of Red Hat Enterprise Linux 7; wget as a component of Red Hat Enterprise Linux 9; wget.src as a component of Red Hat Enterprise Linux 9 · Fixed: wget-0:1.19.5-16.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.src as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
    After
    wget as a component of Red Hat Enterprise Linux 6; wget.src as a component of Red Hat Enterprise Linux 6; wget as a component of Red Hat Enterprise Linux 7; wget.src as a component of Red Hat Enterprise Linux 7 · Fixed: wget-0:1.24.5-8.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-0:1.24.5-8.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-0:1.24.5-8.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-0:1.24.5-8.el10_2.src as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-0:1.24.5-8.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debuginfo-0:1.24.5-8.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debuginfo-0:1.24.5-8.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debuginfo-0:1.24.5-8.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debuginfo-0:1.24.5-8.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debugsource-0:1.24.5-8.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debugsource-0:1.24.5-8.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debugsource-0:1.24.5-8.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-debugsource-0:1.24.5-8.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); wget-0:1.19.5-16.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.src as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.19.5-16.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debuginfo-0:1.19.5-16.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-debugsource-0:1.19.5-16.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); wget-0:1.21.1-11.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); wget-0:1.21.1-11.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); wget-0:1.21.1-11.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); wget-0:1.21.1-11.el9_8.src as a component of Red Hat Enterprise Linux AppStream (v. 9); and 9 more
    Red Hat Product Security ↗
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-2026-42083↗Vendor CSAF · SUSE Product Security Team↗CVE authority or vendor reference↗Patch or update 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-2026-58471 · cve.blacktree.nl