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CVE-2026-55953 is a cipher-suite negotiation validation flaw in the Erlang/OTP ssl client for TLS 1.2 and earlier and DTLS. The client-side TLS handshake logic accepts the cipher suite selected in a ServerHello without verifying that it was included in the client’s ClientHello offer. The selected suite is installed without a membership check. An on-path attacker can therefore impersonate the intended server and select an unoffered anonymous key-exchange cipher suite. Because anonymous suites do not require a server certificate, this bypasses certificate-chain validation and hostname verification, including configurations using verify_peer and configured trust anchors. TLS 1.3 clients are not affected because their negotiation path validates the selected cipher suite. Affected releases are OTP 17.0 through versions preceding OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4; corresponding affected ssl releases begin at 5.3.4 and precede ssl 11.2.12.11, 11.6.0.4, and 11.7.4, respectively. The status of OTP releases before 17.0 is unknown.
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A vulnerability in Erlang fixed in the Fedora 43 erlang-26.2.5.21-7.fc43 security update; no technical vulnerability details are provided.
A vulnerability in Erlang fixed by the Fedora 44 erlang-26.2.5.21-7.fc44 security update.
A security vulnerability in Erlang addressed by the Fedora 44 erlang-26.2.5.21-6.fc44 update. The content provides no vulnerability type, impact, or technical details.
A security vulnerability in Erlang addressed by the Fedora 43 erlang-26.2.5.21-6.fc43 update. The content provides no vulnerability type, impact, or technical details.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.