Buffer overflow in Bakulf Libnxml
CVE-2026-123202
libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxm… (technical-description)
- github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a (patch)
- github.com/bakulf/libnxml/releases/tag/0.18.6 (release-notes)
- www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123202?
- CVE-2026-123202 is a high-severity vulnerability in Bakulf Libnxml, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-11-05.
- How severe is CVE-2026-123202?
- High severity. CVSS v3 base score is 7.5 out of 10.