Vulnerability details
CVE-2026-54059
python-pillow Pillow
Pillow: PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading
CVSS 3.1
7.5High
Official description
Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. This issue is fixed in version 12.3.0.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| python-pillow | Pillow | < 12.3.0 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d x_refsource_MISC
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst x_refsource_MISC
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x x_refsource_CONFIRM
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Details
- Published
- 2026-07-06
- Last updated
- 2026-07-07
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.41%
Probability of exploitation in 30 days
35.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-789Memory Allocation with Excessive Size Value