SB2026062441 - Resource exhaustion in envoy

Description

This security bulletin contains information about 1 vulnerability.

1) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper resource management in the HTTP/3 QPACK decoder when processing blocked QPACK header blocks in HEADERS frames. A remote attacker can send a syntactically valid HEADERS frame that remains blocked on dynamic table updates to cause a denial of service.

Exploitation requires HTTP/3 to be enabled, support for the QPACK dynamic table, and a non-zero blocked-stream setting.

Remediation

Install update from vendor's website.

References

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-p7c7-7c47-pwch
• https://github.com/google/quiche/issues/105