HIGH

CVE-2026-55379

CVSS v3

7.5

HIGH

EPSS Score

0.4 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

pillowPyPIall versions · fixed in 12.3.0
pillowBitnamiall versions · fixed in 12.3.0
python3-pillowAlmaLinux:8all versions · fixed in 5.1.1-22.el8_10and 3 other packages

Vendor advisories

CVE-2026-55379 Red Hat Product Security272 products fixed · 18 known affected
python-pillow: Pillow: Denial of Service via crafted BDF font file
exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · openshift-lightspeed/lightspeed-service-api-rhel9 as a component of OpenShift Lightspeed
RHSA-2026:81110 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Quay
RHSA-2026:76150 Red Hat Product Security7 products fixed
Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.4.5 security update
RHSA-2026:76149 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.4.5 security update
RHSA-2026:70996 Red Hat Product Security2 products fixed
Red Hat Security Advisory: Red Hat AI Inference Model Optimization Tools 3.4.5 (cuda)
RHSA-2026:70995 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat AI Inference 3.4.5 (rocm)

35 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-07-06
Last Modified: 2026-07-07
GitHub Advisory: GHSA-45hq-cxwh-f6vc

Frequently asked questions

What is CVE-2026-55379?

Is CVE-2026-55379 actively exploited?

Active exploitation of CVE-2026-55379 has not been confirmed. Its EPSS score was 0.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-55379?

CVE-2026-55379 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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