CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2026-107891
High (8.1) in musl -libc musl.
On this page
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.
Severity
- CWE
- CWE-190 Integer Overflow or Wraparound (Year 2038 problem, Y2K38, Y2038, Epochalypse)
- Published
- Record from
- the CVE List, synced
Ask an AI about this CVE
Show the prompt
Explain CVE-2026-107891 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-107891?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-107891?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-107891 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Affected
- musl -libc:musl
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| musl -libc musl | from 0.5.0 before 1.2.7 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13 | musl | no fix listed | DEBIAN-CVE-2026-107891 |
| Debian | 14 | musl | 1.2.6-2 | DEBIAN-CVE-2026-107891 |
| Ubuntu | 22.04:LTS, 24.04:LTS, 26.04:LTS and 5 more | musl | no fix listed | UBUNTU-CVE-2026-107891 |
| Alpaquita | 23 | musl-default | 1.2.4-r15 | BELL-CVE-2026-107891 |
| Alpaquita | 23 | musl-perf | 1.2.4-r11 | BELL-CVE-2026-107891 |
| Alpaquita | 25 | musl-default | 1.2.5-r17 | BELL-CVE-2026-107891 |
| Alpaquita | 25 | musl-perf | 1.2.5-r19 | BELL-CVE-2026-107891 |
| Alpaquita | stream | musl-perf, musl-default | 1.2.6-r6 | BELL-CVE-2026-107891 |
| BellSoft Hardened Containers | 23 | musl-default | 1.2.4-r15 | BELL-CVE-2026-107891 |
| BellSoft Hardened Containers | 23 | musl-perf | 1.2.4-r11 | BELL-CVE-2026-107891 |
| BellSoft Hardened Containers | 25 | musl-default | 1.2.5-r17 | BELL-CVE-2026-107891 |
| BellSoft Hardened Containers | 25 | musl-perf | 1.2.5-r19 | BELL-CVE-2026-107891 |
| BellSoft Hardened Containers | stream | musl-perf, musl-default | 1.2.6-r6 | BELL-CVE-2026-107891 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; BellSoft's OSV database, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · Alpaquita · BellSoft Hardened Containers.
Attack patterns (CAPEC)
- CAPEC-92 Forced Integer Overflow Likelihood: High · Severity: High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.