CVE-2026-56001: libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
CSIRTS triage
- What
- An integer overflow heap buffer overflow vulnerability exists in BitmapScaleBitmaps.
- Who is affected
- Users of libXfont2 are affected.
- Urgency
- High urgency for remediation due to the severity of the vulnerability.
- Action
- Update libXfont2 to the latest version to mitigate this vulnerability.
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-2026-56001
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-2026-560010.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56001 | 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-2026-56001: A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 3…nvd
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