CVE-2026-73248

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% (8th percentile of EPSS-scored CVEs). 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: 0.2%CVSS: 8.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

calibre is an e-book manager. Prior to 9.12.0, calibre processes attacker-controlled composite_template metadata from a malicious EPUB, OPF, PDF, or similar file through program: and a nested template() call whose formatter does not inherit allow_python_templates=False, allowing a nested python: template to reach compile_python_template and execute arbitrary Python code when the file is opened or imported. This issue is fixed in version 9.12.0.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
54
EG Risk 54/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 11, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

version 9.12.0

Patch available: kovidgoyal/calibre v9.12.0

https://github.com/kovidgoyal/calibre/releases/tag/v9.12.0
github_commit Patch Available

commit dac999045837 (kovidgoyal/calibre)

Patch available: kovidgoyal/calibre v9.12.0 (contains commit dac999045837)

https://github.com/kovidgoyal/calibre/commit/dac9990458374a81a5372a768bba6527d965aac8
githubMentions a patch (unverified)🟡 PoC Available

Arbitrary code execution via nested `template()` that bypasses Python template restrictions · Advisory · kovidgoyal/calibre · GitHub

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4f7g-rjfp-hmvx

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
calibre6.13.0+repack-2 ... 9.9.0+ds+~0.10.6-1 (168 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
calibre8.10.0+ds-1 ... 9.9.0+ds+~0.10.6-1 (73 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
calibre8.10.0+ds-1 ... 9.9.0+ds+~0.10.6-1 (63 versions)
  • every version up to 9.12.0+ds+~0.10.6-1: fixed in 9.12.0+ds+~0.10.6-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 44× 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 103 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-07 23:48 UTCEPSS rescore
  3. 2026-10-06 17:34 UTCEG score recompute
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  1. 2026-09-21 21:09 UTCEPSS rescore
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  20. 2026-09-10 09:35 UTCEPSS rescore
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  25. 2026-09-06 13:48 UTCEPSS rescore
  26. 2026-09-06 00:31 UTCEG score recompute
  27. 2026-09-04 14:53 UTCEG score recompute
  28. 2026-09-04 05:07 UTCEPSS rescore
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  36. 2026-08-31 06:31 UTCEG score recompute
  37. 2026-08-30 19:18 UTCEPSS rescore
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  40. 2026-08-30 01:22 UTCEPSS rescore
  41. 2026-08-29 08:59 UTCEG score recompute
  42. 2026-08-28 21:42 UTCEPSS rescore
  43. 2026-08-27 14:59 UTCEG score recompute
  44. 2026-08-27 14:25 UTCEPSS rescore
  45. 2026-08-26 16:34 UTCEG score recompute
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  47. 2026-08-25 18:10 UTCEG score recompute
  48. 2026-08-25 13:49 UTCEPSS rescore
  49. 2026-08-24 19:43 UTCEG score recompute
  50. 2026-08-23 09:53 UTCEG score recompute
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  53. 2026-08-21 23:49 UTCEPSS rescore
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  57. 2026-08-19 17:04 UTCEPSS rescore
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  64. 2026-08-16 14:56 UTCEPSS rescore
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  66. 2026-08-16 07:56 UTCEG score recompute
  67. 2026-08-16 02:15 UTCEPSS rescore
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  72. 2026-08-13 01:35 UTCEG score recompute
  73. 2026-08-12 14:23 UTCEG score recompute
  74. 2026-08-12 13:59 UTCEG score recompute
  75. 2026-08-12 13:51 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-73248?
CVE-2026-73248 is a high vulnerability published on August 11, 2026. calibre is an e-book manager. Prior to 9.12.0, calibre processes attacker-controlled compositetemplate metadata from a malicious EPUB, OPF, PDF, or similar file through program: and a nested template() call whose formatter does not inherit allowpythontemplates=False, allowing a nested python:…
When was CVE-2026-73248 disclosed?
CVE-2026-73248 was first published on August 11, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73248 actively exploited?
CVE-2026-73248 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73248?
CVE-2026-73248 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73248?
A fix for CVE-2026-73248 is available: update to the fixed version the vendor names in its advisory.

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