CVE-2026-34183
Reported by openssl · Published June 9, 2026
Issue 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 Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| OpenSSL | OpenSSL | 4.0.0, 3.6.0, 3.5.0 |
| wolfi | openssl | 0 |
| OpenSSL | OpenSSL | 3.4.0, 4.0.0, 3.6.0 |
| alpine | openssl | 0, 0, 0 |
Timeline
- Jun 9, 2026 CVE Published
- Jun 10, 2026 Coalition ESS Score
- Jun 11, 2026 Distribution Patch
- Jun 11, 2026 Security Advisory
- Jun 11, 2026 Distribution Patch
- Jun 11, 2026 Security Advisory
References
- OpenSSL Advisory vendor-advisory
- 4.0.1 git commit patch
- 3.6.3 git commit patch
- 3.5.7 git commit patch
- 3.4.6 git commit patch
- 4.0.1 git commit patch
- 3.6.3 git commit patch
- 3.5.7 git commit patch
- 3.4.6 git commit patch