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CVE-2025-29786 is an uncontrolled resource-consumption vulnerability in the Expr expression language for Go before version 1.17.0. When compiling an expression of unbounded length, the parser constructs abstract syntax tree nodes for the expression without sufficient compile-time limits on node count or parsing memory. A pathologically large or deeply structured expression can therefore cause excessive memory allocation while the AST is built.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory-exhaustion vulnerability in the expr-lang/expr parser when processing unrestricted input, potentially causing denial of service.
A memory-exhaustion vulnerability in the Expr parser when it processes unrestricted input, addressed by the Red Hat opentelemetry-collector security update.
A memory-exhaustion vulnerability in the github.com/expr-lang/expr parser when processing unrestricted input, addressed in the Red Hat OpenTelemetry Collector update.
A memory-exhaustion vulnerability in the Expr parser when processing unrestricted input.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.