CVE-2026-86137
CVE-2026-86137 is a low-severity vulnerability in Xmlsoft Libxml2 with a CVSS 3.x base score of 2.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Low (CVSS 3.x base score 2.9)
- EPSS exploit prediction: 0% (8th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Xmlsoft Libxml2
- Published:
- Last modified:
Description
In libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds read, aka an out-of-bounds read in the NXT macro in xmlregexp.
Frequently asked questions
- What is CVE-2026-86137?
- In libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds read, aka an out-of-bounds read in the NXT macro in xmlregexp.
- How severe is CVE-2026-86137?
- CVE-2026-86137 has a CVSS 3.x base score of 2.9, rated low severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2026-86137 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-86137?
- CVE-2026-86137 affects Xmlsoft Libxml2. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-86137?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-86137 published?
- CVE-2026-86137 was published on 2026-09-05 and last updated on 2026-09-15.
References
- https://github.com/GNOME/libxml2/commit/76fe08d97de88bfaef2f7d5cd27f11954cc5bee2
- https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4
- https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1099
Affected products (1)
- cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
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