Retransmitted QUIC CRYPTO Frames Can Cause DoS or One-byte Disclosure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-95691
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-10 19:21:39 UTC
Updated2026-11-10 22:10:04 UTC
DescriptionIssue summary: A retransmitted QUIC CRYPTO frame can release packet storage while the TLS record layer retains a direct pointer into that storage causing use after free. Impact summary: A malicious QUIC server can cause a heap-use-after-free read in the OpenSSL QUIC client. The server can also identify one allocator-adjacent byte through the client's protected Handshake response. CWE: CWE-416: Use After Free Description: During CRYPTO stream processing, a pointer into the first frame's memory on the stream is lent to the TLS handshake processing. The memory must remain stable until it is processed and released. However the processing of retransmitted CRYPTO frames could release the memory if the retransmitted frame fully overlapped the existing frame. This then causes use-after-free read when the TLS handshake processing continues. The use-after-free read can lead to a Denial-of-Service of the client application or a minor leak of information about the heap memory contents that might be overwritten with other data, subsequently allocated by the application, to the peer. FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.

Risk And Classification

Problem Types: CWE-416 | CWE-416 CWE-416 Use After Free

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected 4.1.0 4.1.1 semver Not specified
CNA OpenSSL OpenSSL affected 4.0.0 4.0.4 semver Not specified
CNA OpenSSL OpenSSL affected 3.5.0 3.5.10 semver Not specified

References

ReferenceSourceLinkTags
github.com/openssl/openssl/commit/ec9d4de9d03989b29db5a3d7efdb4c285deaf386 [email protected] github.com
github.com/openssl/openssl/commit/f6244675833e097c2429a40d1b206d95385bd42f [email protected] github.com
github.com/openssl/openssl/commit/dd90ceb99a3c2ddba336bb4a00be9ebabd84c2a1 [email protected] github.com
openssl-library.org/news/secadv/20261110.txt [email protected] openssl-library.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Filipe Casal (Trail of Bits) (en)

CNA: Filipe Casal (Trail of Bits) (en)

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