Is CVE-2026-109349 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109349 being exploited in the wild.

How severe is CVE-2026-109349?

Medium severity, with a CVSS score of 6.5, published 12 October 2026.

Which products and versions are affected?

GitoxideLabs Gix-Pack before 0.75.0.

Is there a fix for CVE-2026-109349?

Yes: fixed in 0.75.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-109349 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-109349?

Check whether you run GitoxideLabs Gix-Pack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-109349: gitoxide gix-pack reachable assertion in pack header decoder

CVE-2026-109349 · Severity: medium · CVSS 6.5 · Published 2026-10-12

gitoxide gix-pack is a Rust library that parses Git pack files during clone and fetch operations. A malicious attacker can send a crafted 12-byte pack header with version 3 to trigger a hard assertion panic in the library, causing the entire clone or fetch operation to abort with no way for the client to recover. This is a trivial pre-authentication denial of service that requires only sending minimal data over the network.

Vendors: GitoxideLabs.

Quick answers

Is CVE-2026-109349 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109349 being exploited in the wild.
How severe is CVE-2026-109349?: Medium severity, with a CVSS score of 6.5, published 12 October 2026.
Which products and versions are affected?: GitoxideLabs Gix-Pack before 0.75.0.
Is there a fix for CVE-2026-109349?: Yes: fixed in 0.75.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-109349 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-109349?: Check whether you run GitoxideLabs Gix-Pack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 0.75.0

Technical details

The pack header decoder in gix-pack/src/data/header.rs explicitly accepts version 3 (returning Ok(Version::V3)), but immediately after, BytesToEntriesIter::new_from_header uses assert_eq!(version, Version::V2) to verify the version—a hard assertion that is compiled into release builds. An attacker can send a pack stream beginning with bytes 50 41 43 4B 00 00 00 03 (PACK version 3) to trigger the panic; with panic="unwind" and no catch_unwind in the read path, this unwinds to the process abort. The fix treats non-V2 versions as a graceful error instead of a panic.

Affected products

GitoxideLabs gix-pack before 0.75.0

Timeline

2026-09-25: disclosed
2026-10-12: advisory

References

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