HOMEVULNERABILITIESCVE-2026-55379
HIGH

CVE-2026-55379

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

7.5
CVSS v3.1
EPSS:0.36%probability of exploitation in 30 daysPercentile:28.4th

Official Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation. This issue is fixed in version 12.3.0.

NVD Source

Technical Analysis

CVE-2026-55379 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/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
ADVISORYhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc
ADVISORYhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc

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/0a263e6264aa5399988d9acd3bbfbca2ca3ec77dPatch
→
https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vcExploit · Vendor Advisory
→
https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vcExploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-55379
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-2026-55379 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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