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libnftnl has Heap-based Buffer Overflow in nftnl::Batch::with_page_size (nftnl-rs)GHSA-2fjw-whxm-9v4q

Fix: mullvad/nftnl-rs@94a286f

GHSA-2fjw-whxm-9v4q is a remote code execution vulnerability in nftnl. A fix is available for nftnl — see the affected versions and patch details below.

Also known asRUSTSEC-2025-0126
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Dec 1, 2025 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀nftnl

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

A heap-buffer-overflow vulnerability exists in the Rust wrapper for libnftnl, triggered via the nftnl::Batch::with_page_size constructor. When a small or malformed page size is provided, the underlying C code allocates an insufficient buffer, leading to out-of-bounds writes during batch initialization.

The flaw was fixed in commit 94a286f by adding an overflow check:

batch_page_size
    .checked_add(crate::nft_nlmsg_maxsize())
    .expect("batch_page_size is too large and would overflow");

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.ionftnlall versions0.9.0cargo update -p nftnl --precise 0.9.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for nftnl, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update nftnl to 0.9.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2fjw-whxm-9v4q is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

A heap-buffer-overflow vulnerability exists in the Rust wrapper for libnftnl, triggered via the nftnl::Batch::with_page_size constructor. When a small or malformed page size is provided, the underlying C code allocates an insufficient buffer, leading to out-of-bounds writes during batch initialization. The flaw was fixed in commit 94a286f by adding an overflow check: ```Rust batch_page_size .checked_add(crate::nft_nlmsg_maxsize()) .expect("batch_page_size is too large and would overflow"); ```
O3 Security · Impact-Aware SCA

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libnftnl has Heap-based Buffer Overflow in nftnl::Batch::wit…