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CVE-2026-34180 is an integer truncation vulnerability in OpenSSL's ASN.1 decoder affecting 64-bit Unix and Unix-like platforms. When a crafted DER-encoded ASN.1 primitive element has content exceeding 2 gigabytes, its content length can be truncated and mishandled. In the worst case, the truncated length causes the decoder to scan binary content for a terminating zero byte, potentially reading beyond the allocated input buffer. Applications passing attacker-supplied data to d2i_X509(), d2i_PKCS7(), or other d2i_* decoding functions are affected. Exploitation may crash the application or incorporate out-of-bounds memory into the decoded object; more typically, the element is truncated. OpenSSL command-line tools, 32-bit platforms, and 64-bit Windows are not affected. The affected code is outside the OpenSSL FIPS module boundary.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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78 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by a CentOS local security-check plugin; no technical flaw details are provided.
A vulnerability referenced by the TuxCare CentOS 8.5 security advisory; no technical flaw details are provided.
A vulnerability addressed by the Huawei EulerOS SA-2026-3855 security update; the content provides no technical vulnerability details or severity for this CVE.
A vulnerability addressed by Huawei EulerOS security advisory EulerOS_SA-2026-3889; no technical flaw description is provided.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.