> CVE-2026-63209 [HIGH]

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PUBLISHED
2026-09-29 15:17
MODIFIED
2026-09-29 15:17
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.37%
Top 71.1%
DATA SOURCES:
NVD 🔗 2026-09-29 RED HAT 🔗 2026-10-04 CWE MITRE 🔗 2026-10-01 FIRST EPSS 🔗 2026-10-21 OSV 🔗 2026-10-19 MSRC 🔗 2026-10-04

> DESCRIPTION

compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.

> AFFECTED_PRODUCTS

Red Hat - Red Hat Hardened Images
Version: 12
Red Hat - Red Hat Hardened Images
Version: 1.8.1
Red Hat - Red Hat Hardened Images
Version: 1.5.4
Red Hat - Red Hat Hardened Images
Version: 14
Red Hat - Red Hat Hardened Images
Version: 0.161.0
Red Hat - Red Hat Hardened Images
Version: 3.22.0
Red Hat - Red Hat Hardened Images
Version: 4.3.0
Red Hat - Red Hat Hardened Images
Version: 0.119.0
Red Hat - Red Hat Hardened Images
Version: 1.52.0
Red Hat - Red Hat Hardened Images
Version: 2.3.0
Red Hat - Red Hat Hardened Images
Version: 1.45.1
Red Hat - Red Hat Hardened Images
Version: 1.24.1
Red Hat - Red Hat Hardened Images
Version: 6.1.2
Red Hat - Red Hat Hardened Images
Version: 10
Red Hat - Red Hat Hardened Images
Red Hat - Red Hat Hardened Images
Version: 0.74.0
Red Hat - Red Hat Hardened Images
Version: 15
Red Hat - Red Hat Hardened Images
Version: 7
Red Hat - Red Hat Hardened Images
Version: 4
Red Hat - Red Hat Hardened Images
Version: 1
Red Hat - Red Hat Hardened Images
Version: 2
Red Hat - Red Hat Hardened Images
Version: 6

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-190 CWE-787

> CWE DETAILED DESCRIPTIONS

CWE-190: Integer Overflow or Wraparound - The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. | CWE-787: Out-of-bounds Write - The product writes data past the end, or before the beginning, of the intended buffer.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat OpenShift distributed tracing platform (Tempo) 3.11.2 release
Red Hat OpenShift distributed tracing platform (Tempo) 3.11.2 has been released
Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.0.17
Logging for Red Hat OpenShift - 6.0.17
Red Hat Security Advisory: Submariner v0.23 security fixes and container updates
Submariner v0.23 General Availability release images, which provide enhancements, security fixes, and updated container images. Red Hat Product Security has rated this update as having a security imp...
Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Integer Overflow or Wraparound and Out-of-bounds Write in compress

AFFECTED PACKAGES:
Unknown / Unknown
117 versions affected
ALIASES:
GHSA-259r-337f-4rfw, GO-2026-5841

> HISTORIQUE DES MODIFICATIONS

Première apparition
29/09/2026 15:17
Source: NVD
📊 ENRICHISSEMENT 04/10/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
📊 ENRICHISSEMENT 04/10/2026 05:02
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
📊 ENRICHISSEMENT 01/10/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-190: Integer Overflow or Wraparound - The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will a...
Total des modifications: 3 Dernière mise à jour: 2 weeks ago

> REFERENCES

https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c9...
https://github.com/klauspost/compress/releases/tag/v1.18.7
https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw
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