TI-2026-69559 Aliases CVE-2026-107570 GHSA-3756-2mxq-33pr

Heap out-of-bounds write in mutt via crafted Content-Type header

LOW 12CWE-823Published 2026-10-08 · Updated 2026-10-09

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Deferred Red Hat: fix deferred

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

mutt through 2.4.2 contains a heap out-of-bounds write in convert_file_from_to() (CWE-823). A crafted Content-Type header lets an attacker write past a heap buffer when an email is used as a template. The attacker needs local access and user interaction to trigger the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

heap OOB write in convert_file_from_to() via a crafted Content-Type header allows attacker to OOB write when email is used as a template.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00152 4th percentileScored 2026-11-07

Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
mutt	mutt	up to 2.4.2	—	No fix listed	CNA

mutt Vendormutt Affected up to 2.4.2 Fixed in — No fix listed CNA

Remediation

No fixed version is listed for mutt. Red Hat lists Red Hat Enterprise Linux 6 with no fix planned and Red Hat Enterprise Linux 7, 8, 9 and 10 with no plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-08 Threatist record created from CVE-2026-107570
2026-10-09 Affected versions changed · Red Hat
2026-10-09 CVSS score added · Red Hat
2026-10-10 Alias added: GHSA-3756-2mxq-33pr

References

Other 1

https://gitlab.com/muttmua/mutt/-/work_items/533

TI-2018-10297 An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. CVSS 3.1CRITICAL 9.8
TI-2018-10300 An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. CVSS 3.1CRITICAL 9.8
TI-2018-10293 An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. CVSS 3.1CRITICAL 9.8
TI-2018-10302 An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. CVSS 3.1CRITICAL 9.8
TI-2018-10301 An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. CVSS 3.1CRITICAL 9.8
TI-2018-10295 An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. CVSS 3.1CRITICAL 9.8

See all 52 →

Sources

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