CVE-2026-25636

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% 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
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 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. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

February 6, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 2, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
generic

CVE-2026-25636: Calibre EPUB Path Traversal to RCE — 0x5t

https://0x5t.raptx.org/posts/calibre-epub-rce
github Patch Available🟡 PoC Available

Path Traversal Leading to Arbitrary File Corruption and Code Execution · Advisory · kovidgoyal/calibre · GitHub

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29
github_commit Patch Available

commit 9484ea82c6ab (kovidgoyal/calibre)

Patch available: kovidgoyal/calibre v9.2.0 (contains commit 9484ea82c6ab)

https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
calibre5.12.0+dfsg-1, 5.12.0+dfsg-1+deb11u1, 5.12.0+dfsg-1+deb11u2, 5.12.0+dfsg-1+deb11u35.12.0+dfsg-1+deb11u4—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
calibre6.13.0+repack-2 ... 6.13.0+repack-2+deb12u5 (6 versions)6.13.0+repack-2+deb12u6—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
calibre8.5.0+ds-1, 8.5.0+ds-1+deb13u18.5.0+ds-1+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
calibre8.10.0+ds-1 ... 9.1.0+ds+~0.10.5-1 (36 versions)9.2.0+ds+~0.10.5-1—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 8× 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.

Showing the most recent 100 of 140 total refreshes for this CVE.

  1. 2026-09-01 04:39 UTCEPSS rescore
  2. 2026-08-31 19:34 UTCOSV refresh
  3. 2026-08-30 19:17 UTCEPSS rescore
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-26 14:46 UTCEPSS rescore
  8. 2026-08-25 13:48 UTCEPSS rescore
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-21 23:49 UTCEPSS rescore
  11. 2026-08-20 22:55 UTCEPSS rescore
  12. 2026-08-19 17:03 UTCEPSS rescore
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  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 10:58 UTCEG score recompute
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 03:16 UTCEG score recompute
  21. 2026-08-12 13:50 UTCEPSS rescore
  22. 2026-08-11 13:42 UTCEPSS rescore
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-09 15:37 UTCEG score recompute
  25. 2026-08-09 13:46 UTCEPSS rescore
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  1. 2026-08-08 16:37 UTCEPSS rescore
  2. 2026-08-07 22:36 UTCEG score recompute
  3. 2026-08-06 13:46 UTCEPSS rescore
  4. 2026-08-06 04:14 UTCEG score recompute
  5. 2026-08-05 19:17 UTCEPSS rescore
  6. 2026-08-04 15:10 UTCEPSS rescore
  7. 2026-08-03 10:36 UTCEPSS rescore
  8. 2026-08-02 21:13 UTCEG score recompute▼ 0.40
  9. 2026-08-02 02:26 UTCEPSS rescore
  10. 2026-08-01 04:16 UTCEPSS rescore
  11. 2026-07-30 16:27 UTCEPSS rescore
  12. 2026-07-30 01:30 UTCEPSS rescore
  13. 2026-07-28 15:36 UTCEPSS rescore
  14. 2026-07-26 14:54 UTCEPSS rescore
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  18. 2026-07-24 14:17 UTCEPSS rescore
  19. 2026-07-23 14:18 UTCEPSS rescore
  20. 2026-07-23 14:18 UTCEPSS rescore
  21. 2026-07-23 03:07 UTCEG score recompute
  22. 2026-07-22 14:08 UTCEPSS rescore
  23. 2026-07-21 15:24 UTCEPSS rescore
  24. 2026-07-21 15:24 UTCEPSS rescore
  25. 2026-07-20 17:08 UTCEPSS rescore
  26. 2026-07-19 14:31 UTCEPSS rescore
  27. 2026-07-19 14:31 UTCEPSS rescore
  28. 2026-07-19 02:29 UTCEPSS rescore
  29. 2026-07-19 02:28 UTCEPSS rescore
  30. 2026-07-18 10:04 UTCEPSS rescore
  31. 2026-07-18 10:04 UTCEPSS rescore
  32. 2026-07-17 18:29 UTCOSV refresh
  33. 2026-07-16 17:03 UTCEPSS rescore
  34. 2026-07-16 17:03 UTCEPSS rescore
  35. 2026-07-15 16:57 UTCEPSS rescore
  36. 2026-07-15 16:57 UTCEPSS rescore
  37. 2026-07-15 02:00 UTCEPSS rescore
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  39. 2026-07-13 22:30 UTCEPSS rescore
  40. 2026-07-13 06:13 UTCEPSS rescore
  41. 2026-07-13 06:13 UTCEPSS rescore
  42. 2026-07-12 05:46 UTCEPSS rescore
  43. 2026-07-12 05:46 UTCEPSS rescore
  44. 2026-07-11 08:27 UTCEPSS rescore
  45. 2026-07-09 19:10 UTCEPSS rescore
  46. 2026-07-08 15:15 UTCEPSS rescore
  47. 2026-07-08 15:15 UTCEPSS rescore
  48. 2026-07-07 13:46 UTCEPSS rescore
  49. 2026-07-06 16:27 UTCEPSS rescore
  50. 2026-07-06 16:27 UTCEPSS rescore
  51. 2026-07-06 02:23 UTCEPSS rescore
  52. 2026-07-06 02:23 UTCEPSS rescore
  53. 2026-07-05 02:30 UTCEPSS rescore
  54. 2026-07-04 06:31 UTCEPSS rescore
  55. 2026-07-04 06:31 UTCEPSS rescore
  56. 2026-07-01 15:06 UTCEPSS rescore
  57. 2026-07-01 15:06 UTCEPSS rescore
  58. 2026-06-30 23:22 UTCEPSS rescore
  59. 2026-06-30 23:22 UTCEPSS rescore
  60. 2026-06-29 16:32 UTCOSV refresh
  61. 2026-06-29 14:06 UTCEPSS rescore
  62. 2026-06-28 14:07 UTCEPSS rescore
  63. 2026-06-28 14:07 UTCEPSS rescore
  64. 2026-06-28 04:56 UTCEPSS rescore
  65. 2026-06-28 04:56 UTCEPSS rescore
  66. 2026-06-27 03:08 UTCEPSS rescore
  67. 2026-06-25 13:49 UTCEPSS rescore
  68. 2026-06-25 13:49 UTCEPSS rescore
  69. 2026-06-24 14:05 UTCEPSS rescore
  70. 2026-06-24 14:05 UTCEPSS rescore
  71. 2026-06-23 21:33 UTCEPSS rescore
  72. 2026-06-23 21:32 UTCEPSS rescore
  73. 2026-06-22 14:25 UTCEPSS rescore
  74. 2026-06-22 14:25 UTCEPSS rescore
  75. 2026-06-21 14:56 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-25636?
CVE-2026-25636 is a high vulnerability published on February 6, 2026. calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to…
When was CVE-2026-25636 disclosed?
CVE-2026-25636 was first published in the National Vulnerability Database on February 6, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-25636 actively exploited?
CVE-2026-25636 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 89.0% of all scored CVEs.
What is the CVSS score of CVE-2026-25636?
CVE-2026-25636 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-25636?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-25636, 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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