CVE-2026-55380: python-pillow pillow
Vulnerability summary
CVE-2026-55380 is a high (CVSS 7.5) vulnerability in python-pillow pillow. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.7% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 16 · Related 6Timeline
- 06-07-2026PublishedVulnerability first disclosed.
- 06-07-2026Last modifiedVulnerability information updated.
Description
Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.
CVSS metrics
7 scores · 7 sources · 1 version- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
0.00 pp
From 0.42% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundPillow
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Chainguard15 products
- label-studio< 1.23.0-r11
- lmcache-cuda-12.8< 0.5.3-r0
- mlflow< 3.16.0-r0 | < 3.14.0-r2
- open-webuiAll versions (No fix recorded) | < 0.10.2-r1 | < 0.11.0-r0
- openstack-horizon-2025.2< 25.5.2_git20260617-r4
Wolfi5 products
- mlflow< 3.16.0-r0 | < 3.14.0-r2
- open-webuiAll versions (No fix recorded) | < 0.10.2-r1 | < 0.11.0-r0
- superset-6.0< 6.0.0-r13
- superset-6.1< 6.1.0-r6
- superset-6.1-iamguarded-compatAll versions (No fix recorded)
Ubuntu2 products
- pillowAll versions (No fix recorded)
- pillow-python2All versions (No fix recorded)
Debian1 product
- pillowAll versions (No fix recorded) | < 12.3.0-1
PyPI1 product
- pillow< 12.3.0
Python1 product
- pillow< 12.3.0
Python-pillow1 product
- pillow< 12.3.0
7 vendors · 26 products
References
10 links- github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pmX Refsource CONFIRMWEBEVIDENCEREPORTAdvisoryExploitVendor Advisory
- github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675X Refsource MISCWEBFIXPatch
- github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstX Refsource MISCWEBAdvisoryREPORTRelease Notes
