uhv: use-after-free read in sanitizeHeadersWithUnderscores with duplicate underscore headers

F-ENVOY-001-003

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

envoyproxy/envoyReported fixenvoyproxy/envoy

uhv: use-after-free read in sanitizeHeadersWithUnderscores with duplicate underscore headers

fixed publicly via issue closure

details

Finding IDs: F-ENVOY-001-003
Status: fixed publicly via issue closure
Reported via: public GitHub issue
Note: public issue #44032 was opened by @1seal and describes a UHV use-after-free read in HeaderValidator::sanitizeHeadersWithUnderscores() when duplicate underscore headers are dropped via non-owning string_view references. the issue is closed and cross-references #44086; tracked as fixed based on the public issue status, without a separate CVE/GHSA or release claim.

F-ENVOY-001-003: Memory safety. Duplicate underscore headers trigger a use-after-free read during sanitization. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-ENVOY-001-003

Security area (1seal assessment): Memory safety. Duplicate underscore headers trigger a use-after-free read during sanitization. Reviewed 24 Sep 2026.

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