Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler

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Summary

CVECVE-2026-34183
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 17:17:05 UTC
Updated2026-06-10 08:16:23 UTC
DescriptionIssue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.

Risk And Classification

Problem Types: CWE-1325 | CWE-1325 CWE-1325 Improperly Controlled Sequential Memory Allocation

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected 4.0.0 4.0.1 semver Not specified
CNA OpenSSL OpenSSL affected 3.6.0 3.6.3 semver Not specified
CNA OpenSSL OpenSSL affected 3.5.0 3.5.7 semver Not specified
CNA OpenSSL OpenSSL affected 3.4.0 3.4.6 semver Not specified

References

ReferenceSourceLinkTags
github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb [email protected] github.com
github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac [email protected] github.com
github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517 [email protected] github.com
openssl-library.org/news/secadv/20260609.txt [email protected] openssl-library.org
github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac [email protected] github.com
github.com/openssl/security/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517 MITRE github.com
github.com/openssl/security/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac MITRE github.com
github.com/openssl/security/commit/d2e9efbe4900a373227deb136e8665401404ffac MITRE github.com
github.com/openssl/security/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb MITRE github.com
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Vendor Comments And Credit

Discovery Credit

CNA: Abhinav Agarwal (en)

CNA: Alexandr Nedvedicky (en)

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