CVE-2026-53511

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% 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
Elevated
8.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.

CVSS v3
8.5
EG Score
8.5(medium)
EPSS
9.7%
KEV
Not listed

Published

July 7, 2026

Last Modified

July 10, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Arbitrary Code Execution in Template Formatter via Book Metadata · Advisory · kovidgoyal/calibre · GitHub

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-2j4m-2q7x-2c47
github_release Patch Available

version 9.10.0

Patch available: kovidgoyal/calibre v9.10.0

https://github.com/kovidgoyal/calibre/releases/tag/v9.10.0
github_commit Patch Available

commit 712f4e1ff5c1 (kovidgoyal/calibre)

Patch available: kovidgoyal/calibre v9.10.0 (contains commit 712f4e1ff5c1)

https://github.com/kovidgoyal/calibre/commit/712f4e1ff5c1e798c335bef3bacc4efdee052e9c

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 33× 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. 2026-07-16 02:15 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 14:39 UTCEG score recompute
  5. 2026-07-15 03:03 UTCEG score recompute
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-15 02:00 UTCEPSS rescore
  8. 2026-07-14 15:27 UTCEG score recompute
  9. 2026-07-14 03:50 UTCEG score recompute
  10. 2026-07-13 22:31 UTCEPSS rescore
  11. 2026-07-13 16:15 UTCEG score recompute
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-13 04:39 UTCEG score recompute
  15. 2026-07-12 17:02 UTCEG score recompute
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-12 05:26 UTCEG score recompute
  18. 2026-07-11 17:51 UTCEG score recompute
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-11 06:15 UTCEG score recompute
  22. 2026-07-10 18:40 UTCEG score recompute
  23. 2026-07-10 07:05 UTCEG score recompute
  24. 2026-07-09 19:29 UTCEG score recompute
  25. 2026-07-09 19:10 UTCEPSS rescore
Show 8 more
  1. 2026-07-09 19:10 UTCEPSS rescore
  2. 2026-07-09 07:53 UTCEG score recompute
  3. 2026-07-08 20:18 UTCEG score recompute
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-08 15:16 UTCEPSS rescore
  6. 2026-07-08 08:40 UTCEG score recompute
  7. 2026-07-07 21:03 UTCEG score recompute
  8. 2026-07-07 21:01 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-53511?
CVE-2026-53511 is a high vulnerability published on July 7, 2026. calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is…
When was CVE-2026-53511 disclosed?
CVE-2026-53511 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53511 actively exploited?
CVE-2026-53511 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53511?
CVE-2026-53511 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2026-53511?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53511, 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.

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