CVE-2026-55380

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(medium)
EPSS
28.2%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 7, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

`GdImageFile._open()`: image dimensions accepted without `_decompression_bomb_check()` — 1037-byte crafted `.gd` file triggers unchecked 4.3 GB C-heap allocation (24× DecompressionBombError threshold) · Advisory · python-pillow/Pillow · GitHub

https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm
github_commit Patch Available

commit f39b0ae6624e (python-pillow/Pillow)

Patch available: python-pillow/Pillow 12.3.0 (contains commit f39b0ae6624e)

https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675
generic

Pillow/docs/releasenotes/12.3.0.rst at main · python-pillow/Pillow · GitHub

https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 23:43 UTCEG score recompute
  2. 2026-07-11 11:16 UTCEG score recompute
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-10 22:48 UTCEG score recompute
  6. 2026-07-10 10:21 UTCEG score recompute
  7. 2026-07-09 21:53 UTCEG score recompute
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 19:10 UTCEPSS rescore
  10. 2026-07-09 09:25 UTCEG score recompute
  11. 2026-07-08 20:57 UTCEG score recompute
  12. 2026-07-08 15:16 UTCEPSS rescore
  13. 2026-07-08 15:16 UTCEPSS rescore
  14. 2026-07-08 08:29 UTCEG score recompute
  15. 2026-07-07 20:02 UTCEG score recompute
  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 07:35 UTCEG score recompute
  19. 2026-07-06 19:07 UTCEG score recompute
  20. 2026-07-06 19:06 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-55380?
CVE-2026-55380 is a high vulnerability published on July 6, 2026. 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.decompressionbomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This…
When was CVE-2026-55380 disclosed?
CVE-2026-55380 was first published in the National Vulnerability Database on July 6, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55380 actively exploited?
CVE-2026-55380 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55380?
CVE-2026-55380 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-55380?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55380, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-55380

Explore →

Is Your Infrastructure Affected by CVE-2026-55380?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs