🛡️ GHSA-fpf5-4jw8-67x8 — rust-zserio

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-789 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

rust-zserio has Unbounded Memory Allocation

Impact

When deserializing arrays, strings or bytes (blob) types zserio first reads the size of the variable, and then allocates sufficient memory to load data. Since the size is always trusted this can be abused by creating a data file with a large size value, causing the zserio runtime to allocate large amounts of memory.

Patches

Please cherry-pick [57f5fb](https://github.com/Danaozhong/rust-zserio/commit/57f5fb4a2a8611d58dbcc1a9221349206dd99c3c).

Workarounds

  • Do not accept zserio-encoded messages from non-trusted sources.
  • Allocate a maximum heap amount to rust-zerio to avoid impacting other applications.

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. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

GHSA-fpf5-4jw8-67x8 is classified as CWE-789: Memory Allocation with Excessive Size Value. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

Affected software

GHSA-fpf5-4jw8-67x8 is recorded against 1 package.

  • rust-zserio

Timeline and source

Published on 7 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-789
Public Exploit ✅ No
Source OSV
Published 2026-05-07
Updated 2026-08-20
Modified 2026-05-07
Fix URL N/A

Affected Packages

Software From version Fixed in
rust-zserio — —

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