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 95% 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
8.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.5Exploit: Elevated riskExposed: 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)
EG Risk
54(Track*)
EG Risk 54/100SSVC: 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
Severity85% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 7, 2026

Last Modified

August 18, 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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
calibre6.13.0+repack-2 ... 9.9.0+ds+~0.10.6-1 (161 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
calibre8.10.0+ds-1 ... 9.9.0+ds+~0.10.6-1 (67 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
calibre8.10.0+ds-1 ... 9.9.0+ds+~0.10.6-1 (59 versions)9.10.0+ds+~0.10.6-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 52× 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. 2026-09-01 13:54 UTCEPSS rescore
  2. 2026-08-30 19:17 UTCEG score recompute
  3. 2026-08-30 19:17 UTCEPSS rescore
  4. 2026-08-30 07:42 UTCEG score recompute
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 21:55 UTCEG score recompute
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-27 01:55 UTCEG score recompute
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-26 12:58 UTCEG score recompute
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-24 20:38 UTCEG score recompute
  14. 2026-08-23 03:16 UTCEG score recompute
  15. 2026-08-23 00:19 UTCEPSS rescore
  16. 2026-08-22 03:57 UTCEG score recompute
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-21 04:11 UTCEG score recompute
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-20 02:11 UTCEG score recompute
  21. 2026-08-19 17:04 UTCEPSS rescore
  22. 2026-08-18 20:47 UTCEG score recompute
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-18 08:30 UTCEG score recompute
  25. 2026-08-18 07:37 UTCEG score recompute
Show 67 more
  1. 2026-08-17 22:33 UTCEG score recompute
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-16 21:47 UTCEG score recompute
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 10:11 UTCEG score recompute
  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 11:02 UTCEG score recompute
  8. 2026-08-15 01:30 UTCEPSS rescore
  9. 2026-08-14 00:17 UTCEG score recompute
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-13 01:06 UTCEG score recompute
  12. 2026-08-12 13:51 UTCEPSS rescore
  13. 2026-08-11 14:21 UTCEG score recompute
  14. 2026-08-11 02:46 UTCEG score recompute
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-09 16:01 UTCEG score recompute
  17. 2026-08-09 13:46 UTCEPSS rescore
  18. 2026-08-07 17:41 UTCEG score recompute
  19. 2026-08-06 18:30 UTCEG score recompute
  20. 2026-08-06 13:47 UTCEPSS rescore
  21. 2026-08-05 19:20 UTCEG score recompute
  22. 2026-08-05 19:17 UTCEPSS rescore
  23. 2026-08-04 20:08 UTCEG score recompute
  24. 2026-08-04 15:10 UTCEPSS rescore
  25. 2026-08-04 10:39 UTCEPSS rescore
  26. 2026-08-03 19:25 UTCEG score recompute
  27. 2026-08-03 10:36 UTCEPSS rescore
  28. 2026-08-02 08:40 UTCEG score recompute
  29. 2026-08-02 02:27 UTCEPSS rescore
  30. 2026-08-01 09:29 UTCEG score recompute
  31. 2026-08-01 04:16 UTCEPSS rescore
  32. 2026-07-30 22:40 UTCEG score recompute
  33. 2026-07-30 16:28 UTCEPSS rescore
  34. 2026-07-30 11:04 UTCEG score recompute
  35. 2026-07-30 01:30 UTCEPSS rescore
  36. 2026-07-28 00:38 UTCEG score recompute
  37. 2026-07-27 00:12 UTCEG score recompute
  38. 2026-07-26 14:54 UTCEPSS rescore
  39. 2026-07-26 12:35 UTCEG score recompute
  40. 2026-07-25 14:18 UTCEPSS rescore
  41. 2026-07-24 14:18 UTCEPSS rescore
  42. 2026-07-23 14:18 UTCEPSS rescore
  43. 2026-07-23 03:19 UTCEG score recompute
  44. 2026-07-22 14:08 UTCEPSS rescore
  45. 2026-07-21 15:25 UTCEPSS rescore
  46. 2026-07-20 17:08 UTCEPSS rescore
  47. 2026-07-19 14:31 UTCEPSS rescore
  48. 2026-07-19 14:31 UTCEPSS rescore
  49. 2026-07-19 02:29 UTCEPSS rescore
  50. 2026-07-18 10:04 UTCEPSS rescore
  51. 2026-07-16 17:03 UTCEPSS rescore
  52. 2026-07-15 16:57 UTCEPSS rescore
  53. 2026-07-15 16:57 UTCEPSS rescore
  54. 2026-07-15 02:00 UTCEPSS rescore
  55. 2026-07-15 02:00 UTCEPSS rescore
  56. 2026-07-13 22:31 UTCEPSS rescore
  57. 2026-07-13 06:13 UTCEPSS rescore
  58. 2026-07-13 06:13 UTCEPSS rescore
  59. 2026-07-12 05:46 UTCEPSS rescore
  60. 2026-07-11 08:27 UTCEPSS rescore
  61. 2026-07-11 08:27 UTCEPSS rescore
  62. 2026-07-09 19:10 UTCEPSS rescore
  63. 2026-07-09 19:10 UTCEPSS rescore
  64. 2026-07-08 15:16 UTCEPSS rescore
  65. 2026-07-08 15:16 UTCEPSS rescore
  66. 2026-07-07 21:03 UTCEG score recompute
  67. 2026-07-07 21:01 UTCMITRE cvelistV5first tracked

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 August 18, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 95.4% of all scored CVEs.
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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