CVE-2022-45939

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-11-28. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, 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: 1%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

GNU Emacs through 28.2 allows attackers to execute commands via shell metacharacters in the name of a source-code file, because lib-src/etags.c uses the system C library function in its implementation of the ctags program. For example, a victim may use the "ctags *" command (suggested in the ctags documentation) in a situation where the current working directory has contents that depend on untrusted input.

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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

November 28, 2022

Last Modified

April 28, 2025

References (10)

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuemacs24-common (24.5+1-6ubuntu1.1+esm1) @ xenial2026-05-25ubuntu
ubuntuemacs-nox (1:26.3+1-1ubuntu2+esm1) @ focal2026-05-25ubuntu
redhatemacs-1:26.1-7.el8_6.32024-03-05redhat
redhatemacs-1:26.1-9.el82023-05-16redhat
redhatemacs-1:27.2-8.el92023-05-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 5 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
emacs1:27.1+1-3.11:27.1+1-3.1+deb11u1—
xemacs2121.4.24-10, 21.4.24-11, 21.4.24-12, 21.4.24-9——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
emacs—1:28.2+1-8—
xemacs21—21.4.24-11—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
emacs1:26.1+1-3.2, 1:26.1+1-3.2+deb10u1, 1:26.1+1-3.2+deb10u21:26.1+1-3.2+deb10u3—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
emacs—1:28.2+1-8—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
emacs—1:28.2+1-8—

Weakness Classification(1)

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

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 4× in last 7d / 27× 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 161 total refreshes for this CVE.

  1. 2026-09-19 15:38 UTCEPSS rescore
  2. 2026-09-16 14:05 UTCEPSS rescore
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  13. 2026-09-04 22:54 UTCOSV refresh
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  7. 2026-08-18 10:04 UTCOSV refresh
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  24. 2026-08-03 05:27 UTCOSV refresh
  25. 2026-08-02 02:24 UTCEPSS rescore
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  49. 2026-07-16 14:49 UTCOSV refresh
  50. 2026-07-15 16:56 UTCEPSS rescore
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  73. 2026-06-28 04:54 UTCEPSS rescore
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  75. 2026-06-27 03:07 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2022-45939?
CVE-2022-45939 is a high vulnerability published on November 28, 2022. GNU Emacs through 28.2 allows attackers to execute commands via shell metacharacters in the name of a source-code file, because lib-src/etags.c uses the system C library function in its implementation of the ctags program. For example, a victim may use the "ctags *" command (suggested in the ctags…
When was CVE-2022-45939 disclosed?
CVE-2022-45939 was first published in the National Vulnerability Database on November 28, 2022, with the most recent update on April 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-45939 actively exploited?
CVE-2022-45939 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.9% of all scored CVEs.
What is the CVSS score of CVE-2022-45939?
CVE-2022-45939 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2022-45939?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-45939, 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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