CVE-2026-63209

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Source
https://cve.org/CVERecord?id=CVE-2026-63209
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63209.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63209
Aliases
Downstream
Published
2026-09-29T14:58:53Z
Modified
2026-09-30T03:55:34Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Integer Overflow or Wraparound and Out-of-bounds Write in compress
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-190",
        "CWE-787"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63209.json"
}
References

Affected packages

Git / github.com/klauspost/compress

Affected ranges

Type
GIT
Repo
https://github.com/klauspost/compress
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8668e357e776d5152ed62f33c17f21b8690664fa
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.18.7"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

v1.*
v1.0
v1.1
v1.10.0
v1.10.1
v1.10.10
v1.10.11
v1.10.2
v1.10.3
v1.10.4
v1.10.5
v1.10.6
v1.10.7
v1.10.8
v1.10.9
v1.11.0
v1.11.1
v1.11.10
v1.11.11
v1.11.12
v1.11.13
v1.11.2
v1.11.3
v1.11.4
v1.11.5
v1.11.6
v1.11.7
v1.11.8
v1.11.9
v1.12.1
v1.12.2
v1.12.3
v1.13.0
v1.13.1
v1.13.2
v1.13.3
v1.13.4
v1.13.5
v1.13.6
v1.14.0
v1.14.1
v1.14.2
v1.14.3
v1.14.4
v1.15.0
v1.15.1
v1.15.10
v1.15.11
v1.15.12
v1.15.13
v1.15.14
v1.15.15
v1.15.2
v1.15.3
v1.15.4
v1.15.5
v1.15.6
v1.15.7
v1.15.8
v1.15.9
v1.16.0
v1.16.1
v1.16.2
v1.16.3
v1.16.4
v1.16.5
v1.16.6
v1.16.7
v1.17.0
v1.17.1
v1.17.10
v1.17.11
v1.17.2
v1.17.3
v1.17.4
v1.17.5
v1.17.6
v1.17.7
v1.17.8
v1.17.9
v1.18.0
v1.18.1
v1.18.2
v1.18.4
v1.18.5
v1.18.6
v1.2
v1.2.1
v1.3.0
v1.4.0
v1.4.1
v1.5.0
v1.6.0
v1.6.1
v1.6.2
v1.7.0
v1.7.1
v1.7.2
v1.7.3
v1.7.4
v1.7.5
v1.7.6
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.5
v1.8.6
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4
v1.9.5
v1.9.6
v1.9.7
v1.9.8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63209.json"