CVE-2026-55379

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 65% 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 week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
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

BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font loading · Advisory · python-pillow/Pillow · GitHub

https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc
github_commit Patch Available

commit 0a263e6264aa (python-pillow/Pillow)

Patch available: python-pillow/Pillow 12.3.0 (contains commit 0a263e6264aa)

https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
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

Vendor Advisories for CVE-2026-55379(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpython-pillow-0:5.1.1-22.el8_102026-07-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
pillow1.0 ... 9.5.0 (106 versions)12.3.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 39× 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. 2026-07-27 00:52 UTCEG score recompute
  2. 2026-07-27 00:52 UTCVendor advisory
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 12:47 UTCEG score recompute
  5. 2026-07-26 12:47 UTCVendor advisory
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 14:18 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:20 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:25 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-19 14:31 UTCEPSS rescore
  14. 2026-07-19 14:31 UTCEPSS rescore
  15. 2026-07-19 02:29 UTCEPSS rescore
  16. 2026-07-18 10:04 UTCEPSS rescore
  17. 2026-07-16 19:56 UTCVendor advisory
  18. 2026-07-16 17:03 UTCEPSS rescore
  19. 2026-07-16 07:55 UTCVendor advisory
  20. 2026-07-15 19:53 UTCVendor advisory
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 07:51 UTCVendor advisory
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 14 more
  1. 2026-07-13 22:31 UTCEPSS rescore
  2. 2026-07-13 06:13 UTCEPSS rescore
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-08 15:16 UTCEPSS rescore
  10. 2026-07-08 15:16 UTCEPSS rescore
  11. 2026-07-07 13:46 UTCEPSS rescore
  12. 2026-07-07 13:46 UTCEPSS rescore
  13. 2026-07-06 19:07 UTCEG score recompute
  14. 2026-07-06 19:06 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-55379?
CVE-2026-55379 is a high vulnerability published on July 6, 2026. Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdfchar() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image.decompressionbombcheck(), bypassing Pillow's documented decompression bomb…
When was CVE-2026-55379 disclosed?
CVE-2026-55379 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-2026-55379 actively exploited?
CVE-2026-55379 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-55379?
CVE-2026-55379 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-55379?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55379, 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

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