cel-rust May Panic During Parsing of Invalid CEL Expressions

published 2025-10-10 12 mo ago modified 2026-10-19 20 d ago also GHSA-wxwx-9fh7-5mrw , EUVD-2025-33786

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

cel-rust is a Common Expression Language interpreter written in Rust. Starting in version 0.10.0 and prior to version 0.11.4, parsing certain malformed CEL expressions can cause the parser to panic, terminating the process. When the crate is used to evaluate untrusted expressions (e.g., user-supplied input over an API), an attacker can send crafted input to trigger a denial of service (DoS). Version 0.11.4 fixes the issue.

Patch / fix

fixed in 1 links 2

crates.io cel 0.11.4

github.com/cel-rust/cel-rust@9df9822 commit
github.com/cel-rust/cel-rust/releases/tag/cel-v0.11.4 release

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 12 mo ago (2025-10-14)

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/cel-rust/cel-rust/security/advisories/GHSA-wxwx-9fh7-5mrw referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
crates.io	cel	>=0.10.0, <0.11.4	0.11.4

Affected products

cel-rust cel-rust

Classification

Weakness

CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary