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Medium

Pillow: Quadratic GIF comment copying during save

  • Disclosed: 21.10.2026
  • Updated: 22.10.2026 00:12

On Pillow 12.3.0 and upstream main (ad277e2761b489681e71b51e91367d46b0ceabb9), a GIF with a long comment causes _get_global_header() to copy portions of the comment repeatedly when saving, including comments carried over from untrusted images. This can lead to a crafted-image CPU denial of service with provisional Moderate severity and CVSS-B 6.9, assuming a network service automatically opens unauthenticated uploads and they are resaved as GIFs. Impact depends on input size, concurrency, and worker CPU limits.

What to do

Upgrade pillow to version 13.0.0 or later.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) pillow >= 9.2.0, < 13.0.0 13.0.0

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-407
Platform
Python (PyPI)
Package
pillow
Disclosed
21.10.2026
Updated
22.10.2026 00:12

Sources and licenses · Edited or translated by DockRay; source rights and applicable licenses are retained.

OSV / GitHub Advisory Database - GHSA-fc9g-5qg7-mf45 - CC BY 4.0

Vulnerability history: pillow

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (89) in the archive
Total entries
89
First → latest
04.2014 10.2026
Without a fix
0
Exploited in attacks
1

Severity breakdown

  • Critical 12
  • High 57
  • Medium 18
  • Low 1
  • Unrated 1

Disclosures per year

earlier: 12

Severity:
  1. Pillow: Infinite loop in MIC n_frames when the embedded TIFF
    High CVE-2026-112390 >= 7.2.0, < 13.0.0 13.0.0
  2. Pillow: Quadratic GIF comment copying during save this entry
    Medium CVE-2026-112891 >= 9.2.0, < 13.0.0 13.0.0
  3. Pillow: NULL dereference in ImagingExpand via rank filters on zero-size images
    High CVE-2026-112392 < 13.0.0 13.0.0
  4. Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0
    High CVE-2026-112405 >= 12.0.0, < 13.0.0 13.0.0
  5. Pillow: Invalid free in FreeType glyph rendering when a stroker is active
    High CVE-2026-112893 >= 10.0.0, < 13.0.0 13.0.0
  6. Pillow: Argument Injection in Ghostscript call, potentially leading into RCE
    Critical CVE-2026-112900 >= 2.6.0, < 13.0.0 13.0.0
  7. Pillow: Out-of-bounds access in _imagingmorph on a zero-width image
    High CVE-2026-112397 < 13.0.0 13.0.0
  8. Pillow: GIF seek keeps rejected size after DecompressionBombError, allowing DoS
    High CVE-2026-112400 >= 9.2.0, < 13.0.0 13.0.0
  9. Pillow: Unbounded recursion parsing a PDF page tree or trailer chain (incomplete fix for CVE-2026-42310)
    High CVE-2026-112895 >= 5.1.0, < 13.0.0 13.0.0
  10. Pillow: Heap buffer overflow in ImagingJpegDecode
    Critical CVE-2026-112403 < 13.0.0 13.0.0
  11. Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial of service
    High CVE-2026-59204 >= 8.2.0, < 12.3.0 12.3.0
  12. Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
    High · 7.5 CVE-2026-59200 >= 5.1.0, < 12.3.0 12.3.0
  13. Pillow: Out-of-bounds read via attacker-controlled row stride on Pillow's mmap path (McIdas AREA files)
    High CVE-2026-54058 < 12.3.0 12.3.0
  14. Pillow: Heap out-of-bounds write in `ImageFilter.RankFilter` via integer overflow in `ImagingExpand`
    High · 8.2 CVE-2026-59197 < 12.3.0 12.3.0
  15. Pillow: Controlled heap out-of-bounds write in Pillow `ImageCmsTransform.apply()` via output mode mismatch
    High · 7.5 CVE-2026-59205 < 12.3.0 12.3.0
  16. Pillow: Heap out-of-bounds write `Image.paste()` / `Image.crop()` via signed coordinate overflow
    High · 7.5 CVE-2026-59199 < 12.3.0 12.3.0
  17. Pillow: `FontFile.compile()`: `Image.new()` called without `_decompression_bomb_check()`
    High · 7.5 CVE-2026-54060 < 12.3.0 12.3.0
  18. Pillow `PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading
    High · 7.5 CVE-2026-54059 < 12.3.0 12.3.0
  19. Pillow `BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font loading
    High · 7.5 CVE-2026-55379 < 12.3.0 12.3.0
  20. Pillow `GdImageFile._open()`: image dimensions accepted without `_decompression_bomb_check()`
    High · 7.5 CVE-2026-55380 < 12.3.0 12.3.0
  21. Pillow has an OOB Write with Invalid PSD Tile Extents (Integer Overflow)
    High CVE-2026-42311 >= 10.3.0, < 12.2.0 12.2.0
  22. FITS GZIP decompression bomb in Pillow
    High · 7.5 CVE-2026-40192 >= 10.3.0, < 12.2.0 12.2.0
  23. Pillow affected by out-of-bounds write when loading PSD images
    High CVE-2026-25990 >= 10.3.0, < 12.1.1 12.1.1
  24. Pillow vulnerability can cause write buffer overflow on BCn encoding
    High · 7.1 CVE-2025-48379 >= 11.2.0, < 11.3.0 11.3.0
  25. Pillow buffer overflow vulnerability
    High · 6.7 CVE-2024-28219 < 10.3.0 10.3.0
  26. Arbitrary Code Execution in Pillow
    Critical · 8.1 CVE-2023-50447 < 10.2.0 10.2.0
  27. An issue was discovered in Pillow before 10.0.0. It is a Denial of Service that uncontrollably allocates memory to process a given task, potentially causing a service to crash by having it run out of
    High · 7.5 CVE-2023-44271 < 10.0.0 10.0.0
  28. libwebp: OOB write in BuildHuffmanTable
    High · 8.8 Exploited in attacks CVE-2023-4863 < 10.0.1 10.0.1
  29. Pillow before 9.3.0 allows denial of service via SAMPLESPERPIXEL.
    High · 7.5 CVE-2022-45199 >= 9.2.0, < 9.3.0 9.3.0
  30. Pillow before 9.2.0 performs Improper Handling of Highly Compressed GIF Data (Data Amplification).
    High · 7.5 CVE-2022-45198 < 9.2.0 9.2.0
  31. Buffer over-flow in Pillow
    High · 7.5 CVE-2022-30595 >= 9.1.0, < 9.1.1 9.1.1
  32. Path traversal in Pillow
    High · 9.1 CVE-2022-24303 < 9.0.1 9.0.1
  33. Arbitrary expression injection in Pillow
    Critical · 9.8 CVE-2022-22817 < 9.0.1 9.0.1
  34. Uncontrolled Resource Consumption in pillow
    High · 7.5 CVE-2021-23437 >= 5.2.0, < 8.3.2 8.3.2
  35. Buffer Overflow in Pillow
    Critical · 9.8 CVE-2021-34552 < 8.3.0 8.3.0
  36. Uncontrolled Resource Consumption in Pillow
    High · 7.5 CVE-2021-28677 < 8.2.0 8.2.0
  37. Potential infinite loop in Pillow
    High · 7.5 CVE-2021-28676 < 8.2.0 8.2.0
  38. Pillow Out-of-bounds Read vulnerability
    High · 9.1 CVE-2021-25288 >= 2.4.0, < 8.2.0 8.2.0
  39. Out-of-bounds Read in Pillow
    High · 9.1 CVE-2021-25287 >= 2.4.0, < 8.2.0 8.2.0
  40. Pillow denial of service
    High · 5.5 CVE-2021-28675 < 8.2.0 8.2.0
Show more (20) Showing 40 of 70

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