HOMEVULNERABILITIESCVE-2026-55380
HIGH

CVE-2026-55380

CWE-789Published: July 6, 2026· Updated: Jul 7, 2026

7.5
CVSS v3.1
EPSS:0.36%probability of exploitation in 30 daysPercentile:28.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-55380 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Python1 product(s)
pillow
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675
ADVISORYhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm
ADVISORYhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm

All References (4)

→
https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstRelease Notes
→
https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675Patch
→
https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pmExploit · Vendor Advisory
→
https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pmExploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-55380
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-789
CISA KEVNo
EPSS (30d)0.36%
Affected1 vendor(s)
PublishedJul 6, 2026

Related CVEs (CWE-789)

CVE-2026-28253
8.7
CVE-2026-20048
7.7
CVE-2026-33524
7.5
CVE-2021-47972
7.5
CVE-2021-47970
7.5
CVE-2026-25899
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-55380 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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