azure linux libXfont2 vulnerabilities

Latest azure linux libXfont2 CVEs

Newest publication first

1. CVE-2026-44950 fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow in libXfont2

   Published 2026-09-10

   Critical·CVSS 9.5 EPSS 0.26%

   fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination...

2. CVE-2026-59679 fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2

   Published 2026-09-10

   Critical·CVSS 9.2 EPSS 0.26%

   fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two...

3. CVE-2026-56003 libXfont2 computeProps Property Buffer Heap Buffer Overflow

   Published 2026-07-08

   High·CVSS 8.8 EPSS 0.40%

   A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

4. CVE-2026-56002 libXfont2 PCF Font Parsing Heap Buffer Overflow

   Published 2026-07-08

   High·CVSS 8.8 EPSS 0.43%

   A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

5. CVE-2026-56001 libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow

   Published 2026-07-08

   High·CVSS 8.8 EPSS 0.39%

   A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.