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No exploitation reportedAwaiting NVD analysis

CVE-2026-107891

No exploitation reported by the sources we read.

  • Published2026-11-05
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

musl libc before 1.2.7, when an untrusted regular expression is used with regcomp, has multiple integer overflows, possibly leading to incorrect allocation sizes and out-of-bounds heap writes.

Timeline

dates in UTC
  1. 2026-11-0515:16CVE publishedCNA

Versions per branch

Products declared by the CNA1 product

As mitre, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • musl -libc muslother versions: unknown
    Affected
    • ≥ 0.5.0, < 1.2.7fixed in 1.2.7semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-05

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • muslUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • muslUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • muslUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • muslUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • muslUbuntu:26.10all versions · no fixed version listed
  • muslUbuntu:26.04:LTSall versions · no fixed version listed
  • muslUbuntu:24.04:LTSall versions · no fixed version listed
  • muslUbuntu:22.04:LTSall versions · no fixed version listed

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-05
  • CNACVSS 3.18.12026-11-05
  • CNAweakness (CWE)CWE-1902026-11-05
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-05

Frequently asked questions

What is CVE-2026-107891?

musl libc before 1.2.7, when an untrusted regular expression is used with regcomp, has multiple integer overflows, possibly leading to incorrect allocation sizes and out-of-bounds heap writes.

Is CVE-2026-107891 actively exploited?

Active exploitation of CVE-2026-107891 has not been confirmed.

What is the CVSS score for CVE-2026-107891?

CVE-2026-107891 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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