🛡️ GHSA-qq4c-hm99-979m — id-map

⚪ Unknown ✅ No Known Exploit CWE-665 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

IdMap from_iter may lead to uninitialized memory being freed on drop

Due to a flaw in the constructor id_map::IdMap::from_iter, ill-formed objects may be created in which the amount of actually initialized memory is less than what is expected by the fields of IdMap. Specifically, the field ids is initialized based on the capacity of the vector values, which is constructed from the provided iterator. However, the length of this vector may be smaller than its capacity.

In such cases, when the resulting IdMap is dropped, its destructor incorrectly assumes that values contains ids.len() == values.capacity() initialized elements and attempts to iterate over and drop them. This leads to dereferencing and attempting to free uninitialized memory, resulting in undefined behavior and potential segmentation faults.

The bug was fixed in commit fab6922, and all unsafe code was removed from the crate.

Note that the maintainer recommends using the following alternatives:

  • [slab](https://crates.io/crates/slab)
  • [slotmap](https://crates.io/crates/slotmap)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

GHSA-qq4c-hm99-979m is classified as CWE-665: Improper Initialization. The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

Affected software

GHSA-qq4c-hm99-979m is recorded against 1 package.

  • id-map

Timeline and source

Published on 18 August 2025 and last revised on 28 October 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Package)
rustsec.org (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE CWE-665
Public Exploit ✅ No
Source OSV
Published 2025-08-18
Updated 2026-08-12
Modified 2025-10-28
Fix URL N/A

Affected Packages

Software From version Fixed in
id-map — —

Similar Threats

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