CVE-2026-109348

Gitoxide gix-mailmap before 0.35.0 CPU Denial of Service via .mailmap Parsing

5.3 Medium

Gitoxide gix-mailmap before 0.35.0 contains a denial of service vulnerability that allows attackers to exhaust CPU through quadratic-time parsing in Snapshot::from_bytes. Attackers can commit a crafted .mailmap with descending-ordered entries forcing repeated front inserts, blocking workers running log, blame, or shortlog for minutes.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.30%Unchanged since Oct 13, 2026

What each source reports

CVE List Score used 5.3

Gitoxide gix-mailmap before 0.35.0 CPU Denial of Service via .mailmap Parsing

Record: CVE-2026-109348
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness: CWE-407
Updated: 2026-11-02

EUVDEUVD-2026-97650 5.3

Record: EUVD-2026-97650
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-mjrq-mxwp-ch57 5.3

Gitoxide gix-mailmap before 0.35.0 contains a denial of service vulnerability that allows...

Record: GHSA-mjrq-mxwp-ch57
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness: CWE-407
Updated: 2026-11-02

NVD 5.3

Record: CVE-2026-109348
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness: CWE-407
Updated: 2026-11-02

OSV 5.3

Gitoxide gix-mailmap before 0.35.0 CPU Denial of Service via .mailmap Parsing

Record: CVE-2026-109348
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-407
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-109348 5.3

Record: DEBIAN-CVE-2026-109348
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-109348 5.3

Record: UBUNTU-CVE-2026-109348
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated: 2026-11-02

Affected products

gitoxidelabs gix-mailmap

Affected packages

Affected packages
Package	Affected	Fixed
`rust-gix-mailmap` Debian:13	All versions, plus listed versions 0.25.1-10.27.4-10.33.0-10.33.2-10.34.1-10.36.0-1	None known
`rust-gix-mailmap` Debian:14	All versions, plus listed versions 0.25.1-10.27.4-10.33.0-10.33.2-10.34.1-10.36.0-1	None known
`rust-gix` Ubuntu:26.10	All versions, plus listed versions 0.73.0-10.83.0-2	None known
`rust-gix` Ubuntu:26.04:LTS	All versions, plus listed versions 0.69.1-10.69.1-20.73.0-10.73.0-1build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-109348 is a medium vulnerability (CVSS 5.3) in Gitoxidelabs Gix-mailmap, published October 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. No source names a fixed version.