Bug 2512087 (CVE-2026-73552) - CVE-2026-73552 envoy: envoy: RBAC safe_regex fails to match non-UTF-8 HTTP header values
Summary: CVE-2026-73552 envoy: envoy: RBAC safe_regex fails to match non-UTF-8 HTTP he...
Keywords:
Status: NEW
Alias: CVE-2026-73552
Deadline: 2026-08-26
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-06 15:01 UTC by OSIDB Bzimport
Modified: 2026-08-31 16:20 UTC (History)
2 users (show)

Fixed In Version:
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Embargoed:

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Description OSIDB Bzimport 2026-08-06 15:01:12 UTC 
safe_regex matching treated accepted non-UTF-8 HTTP header bytes as an ordinary non-match. In RBAC policies using negative matching logic, this could cause a rule to fail open and allow access to a protected resource. The fix uses the Latin-1 character set when applying regular expressions to byte-oriented HTTP values.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (7.5)

Embargoed until 2026-08-26 13:00 GMT per Envoy upstream disclosure. PSIRTSUPT-21132.
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