Out-of-bounds write in musl-libc musl
Priority LOW 37CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
musl libc 0.9.13 through 1.2.5 before 1.2.6 has an out-of-bounds write vulnerability when an attacker can trigger iconv conversion of untrusted EUC-KR text to UTF-8.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00349 28th percentileScored 2026-11-07
Fix Fixed musl (musl-libc): 1.2.6
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA musl (musl-libc) Fixed in 1.2.6
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2025-26519
- 2026-10-03 Alias added: GHSA-xpv5-92cc-8f65
References
Patch 2
Advisory 7
- https://www.openwall.com/lists/oss-security/2025/02/13/2
- http://www.openwall.com/lists/oss-security/2025/02/13/2
- http://www.openwall.com/lists/oss-security/2025/02/13/3
- http://www.openwall.com/lists/oss-security/2025/02/13/4
- http://www.openwall.com/lists/oss-security/2025/02/13/5
- http://www.openwall.com/lists/oss-security/2025/02/14/5
- http://www.openwall.com/lists/oss-security/2025/02/14/6
More musl-libc Musl vulnerabilities
- TI-2019-10919 musl libc through 1.1.23 has an x87 floating-point stack adjustment imbalance, related to… CVSS 3.1CRITICAL 9.8
- TI-2015-01634 Stack-based buffer overflow in the inet_pton function in network/inet_pton.c in musl libc… CVSS 3.0CRITICAL 9.8
- TI-2014-02811 Out-of-bounds write in musl libc CVSS 3.1CRITICAL 9.8
- TI-2017-11441 musl libc before 1.1.17 has a buffer overflow via crafted DNS replies because… CVSS 3.0HIGH 7.5
- TI-2020-17460 In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination… CVSS 3.1MEDIUM 5.5
Sources
- CVE-2025-26519 · CVE Program
- CVE-2025-26519 · NVD
- FIRST EPSS
- GHSA-xpv5-92cc-8f65 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-26519 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences