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TI-2026-55326 Aliases CVE-2026-79992GHSA-42vv-cfp2-9qc8

Emacs: emacs: command injection via crafted filenames in tramp

Priority LOW 35CWE-78Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 5 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-78.

Summary

A flaw was found in Emacs TRAMP. A local attacker could exploit this vulnerability by processing maliciously crafted filenames. This occurs because TRAMP concatenates login arguments without proper sanitization, which are then passed to a local shell. Successful exploitation could lead to arbitrary code execution.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00219 12th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 5 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 10—1:29.4-14.el10_2.3Patch availableCNA
Red HatRed Hat Enterprise Linux 8—1:26.1-15.el8_10.2Patch availableCNA
Red HatRed Hat Enterprise Linux 8—1:26.1-15.el8_10.2Patch availableCNA
Red HatRed Hat Enterprise Linux 9—1:27.2-18.el9_8.2Patch availableCNA
Red HatRed Hat Enterprise Linux 6——No fix listedCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 1:29.4-14.el10_2.3 Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 1:26.1-15.el8_10.2 Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 1:26.1-15.el8_10.2 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1:27.2-18.el9_8.2 Patch available CNA
  • Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 6

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10.210.2—Red Hat
cpe:/a:redhat:enterprise_linux:8::appstream8—Red Hat
cpe:/o:redhat:enterprise_linux:8::baseos8—Red Hat
cpe:/a:redhat:enterprise_linux:9::appstream9—Red Hat
cpe:/o:redhat:rhel_els:66—Red Hat
cpe:/o:redhat:rhel_els:77—Red Hat
  • cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:8::appstream Versions 8 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:8::baseos Versions 8 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:9::appstream Versions 9 — ·Red Hat
  • cpe:/o:redhat:rhel_els:6 Versions 6 — ·Red Hat
  • cpe:/o:redhat:rhel_els:7 Versions 7 — ·Red Hat

Remediation

Red Hat 3 advisories

  • RHSA-2026:84591 Released 2026-10-19 · Red Hat rating Important
    emacs security update
    • Red Hat Enterprise Linux AppStream (v. 10) emacs-1:29.4-14.el10_2.3, emacs-common-1:29.4-14.el10_2.3, emacs-lucid-1:29.4-14.el10_2.3 +1
    • Red Hat Enterprise Linux BaseOS (v. 10) emacs-1:29.4-14.el10_2.3, emacs-filesystem-1:29.4-14.el10_2.3
  • RHSA-2026:80507 Released 2026-10-12 · Red Hat rating Important
    emacs security update
    • Red Hat Enterprise Linux AppStream (v. 9) emacs-1:27.2-18.el9_8.2, emacs-common-1:27.2-18.el9_8.2, emacs-filesystem-1:27.2-18.el9_8.2 +2
  • RHSA-2026:80506 Released 2026-10-12 · Red Hat rating Important
    emacs security update
    • Red Hat Enterprise Linux AppStream (v. 8) emacs-1:26.1-15.el8_10.2, emacs-common-1:26.1-15.el8_10.2, emacs-lucid-1:26.1-15.el8_10.2 +2
    • Red Hat Enterprise Linux BaseOS (v. 8) emacs-1:26.1-15.el8_10.2, emacs-filesystem-1:26.1-15.el8_10.2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:84591
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:80506
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:80507
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:84591
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:80506

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-79992
  2. 2026-10-03 Alias added: GHSA-42vv-cfp2-9qc8
  3. 2026-10-12 Fix available: RHSA-2026:80507 · Red Hat
  4. 2026-10-12 Fix available: Red Hat Enterprise Linux AppStream (v. 9) · Red Hat
  5. 2026-10-12 Fix available: emacs@1:27.2-18.el9_8.2 · CNA
  6. 2026-10-12 1 new reference · CNA
  7. 2026-10-12 Fix available: emacs@1:26.1-15.el8_10.2 · CNA
  8. 2026-10-12 1 new reference · CNA
  9. 2026-10-12 Fix available: RHSA-2026:80506 · Red Hat
  10. 2026-10-12 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8) · Red Hat
  11. 2026-10-19 Fix available: emacs@1:29.4-14.el10_2.3 · CNA
  12. 2026-10-19 1 new reference · CNA
  13. 2026-10-19 Fix available: RHSA-2026:84591 · Red Hat
  14. 2026-10-19 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · Red Hat

References

Advisory 3

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences