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A denial-of-service vulnerability in OpenSSL TLS 1.3 certificate compression handling allows a peer to force excessive memory allocation before certificate decompression. When processing a TLS 1.3 CompressedCertificate message, OpenSSL uses the peer-supplied uncompressed certificate length to grow a heap buffer prior to decompression, but does not bound that length against the configured max_cert_list certificate size limit. As a result, a malicious peer can trigger allocation of a large buffer of up to approximately 22 MiB per connection, followed by handshake failure. The issue affects OpenSSL 3.6, 3.5, 3.4, and 3.3 when TLS 1.3 certificate compression support is compiled in and at least one certificate compression algorithm is available and negotiated. OpenSSL 3.0, 1.1.1, and 1.0.2 are not affected. No memory corruption or information disclosure has been described.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in OpenSSL addressed indirectly through upgraded third-party components in Tenable Security Center.
A Low-severity OpenSSL TLS 1.3 certificate-compression memory-exhaustion bug where a peer-supplied length expands a heap buffer before validation.
An OpenSSL vulnerability patched by upgrading to OpenSSL 3.6.1 in IPFire Core Update 200.
Unknown (listed among related OpenSSL CVEs, but not described in the content).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.