CVE-2026-56002: libXfont2 PCF Font Parsing Heap Buffer Overflow
CSIRTS triage
- What
- There is a heap buffer overflow in PCF font parsing.
- Who is affected
- Deployments of libXfont2 are affected.
- Urgency
- Remediation is urgent due to the high severity and potential for exploitation.
- Action
- Update to the latest version of libXfont2.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56002
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-560020.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56002 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[NEW] [medium] X.Org X11 Server (libXfont2): Multiple vulnerabilities allow execution of arbitrary code with a…cert-bund
- unknownUSN-8560-1: libXfont vulnerabilitiesubuntu
- unknownDSA-6388-1 libxfont - security updatedebian
- unknownMultiple vulnerabilities in Microsoft Azure Linux (July 15, 2026)cert-fr-avis
- highCVE-2026-56002: A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.…nvd
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