CVE-2026-59204

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% 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, nvd
Elevated
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. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates total_component_width across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and trigger out-of-memory failures during decoding. This issue is fixed in version 12.3.0.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
32.4%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 21, 2026

Advisory Details (4)

Auto-updated Jul 14, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

12.3.0

Patch available: python-pillow/Pillow 12.3.0

https://github.com/python-pillow/Pillow/releases/tag/12.3.0
github_commit Patch Available

commit 13ada4117214 (python-pillow/Pillow)

Patch available: python-pillow/Pillow 12.3.0 (contains commit 13ada4117214)

https://github.com/python-pillow/Pillow/commit/13ada41172142f2fd9f0906f615a00ea623a11ca
github_pr Patch Available

Calculate JPEG2000 total_component_width for each tile in isolation

Patch available: python-pillow/Pillow 12.3.0 (PR #9704 merged 2026-06-22)

https://github.com/python-pillow/Pillow/pull/9704
github Patch Available🟡 PoC Available

Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial of service · Advisory · python-pillow/Pillow · GitHub

https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44j

Vendor Advisories for CVE-2026-59204(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
pillow10.0.0 ... 9.5.0 (27 versions)12.3.0—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 16× 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. 2026-07-23 03:21 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-22 14:08 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-21 15:25 UTCEPSS rescore
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-19 14:31 UTCEPSS rescore
  8. 2026-07-19 02:29 UTCEPSS rescore
  9. 2026-07-18 10:04 UTCEPSS rescore
  10. 2026-07-16 17:03 UTCEPSS rescore
  11. 2026-07-15 16:57 UTCEPSS rescore
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 04:43 UTCEG score recompute▼ 1.20
  14. 2026-07-14 21:22 UTCNVD updateCVSS v3 → 7.5
  15. 2026-07-14 15:41 UTCEG score recompute
  16. 2026-07-14 15:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-59204?
CVE-2026-59204 is a high vulnerability published on July 14, 2026. Pillow is a Python imaging library. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates totalcomponentwidth across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and…
When was CVE-2026-59204 disclosed?
CVE-2026-59204 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59204 actively exploited?
CVE-2026-59204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-59204?
CVE-2026-59204 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59204?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59204, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59204

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