SB20260728132 - Anolis OS update for python-pillow
Published: July 28, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 vulnerabilities.
1) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-54059)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to memory allocation with excessive size value in PcfFontFile._load_bitmaps() when parsing a crafted PCF font file. A remote attacker can supply a crafted PCF font with oversized glyph dimensions to cause a denial of service.
The issue occurs because glyph dimensions from the PCF METRICS section are passed to Image.frombytes() without a decompression bomb check before memory allocation.
2) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-54060)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to memory allocation with excessive size value in FontFile.compile() in PIL/FontFile.py when assembling glyph images from a crafted BDF or PCF font into a combined bitmap. A remote attacker can supply a specially crafted font file to cause a denial of service.
The issue affects the font loading code path used by BdfFontFile and PcfFontFile, where the standard decompression bomb guard is not invoked before the combined bitmap is created.
3) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-55379)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to memory allocation with excessive size value in the PIL/BdfFontFile.py bdf_char() font loading path when parsing a crafted BDF font file with oversized BBX dimensions and an empty BITMAP section. A remote attacker can supply a specially crafted BDF font file to cause a denial of service.
Loaded glyph images persist in memory for the lifetime of the font object.
4) Heap-based buffer overflow (CVE-ID: CVE-2026-59197)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service and overwrite heap memory.
The vulnerability exists due to a heap-based buffer overflow in the ImageFilter.RankFilter API and ImagingExpand function when processing a very large odd filter size through public rank-filter classes. A remote attacker can supply a specially crafted filter size to cause a denial of service and overwrite heap memory.
The issue is reachable through documented public classes including RankFilter, MedianFilter, MinFilter, and MaxFilter. If the image is also attacker-supplied, the out-of-bounds value written past the allocation can be influenced by source image border pixels.
5) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-59204)
CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper memory allocation in the JPEG2000 tiled decoder in src/libImaging/Jpeg2KDecode.c when parsing a crafted tiled JPEG2000 image during decoding. A remote attacker can supply a specially crafted tiled JPEG2000 file to cause a denial of service.
The issue occurs because total_component_width is accumulated across tiles and then used to calculate tile_bytes, which can grow the scratch buffer to roughly the decompressed size of the full image.
Remediation
Install update from vendor's website.