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CVE-2026-34180 is a low-severity vulnerability in OpenSSL's ASN.1 decoder caused by integer truncation while parsing crafted DER-encoded ASN.1 primitive elements whose content length exceeds 2 gigabytes. On affected 64-bit Unix and Unix-like platforms, the oversized length is mishandled during d2i_* decoding operations such as d2i_X509(), d2i_PKCS7(), and related ASN.1 deserialization paths. In the worst case, the truncated length is interpreted in a way that causes the decoder to scan for a terminating zero byte and read less than intended or beyond the end of the allocated input buffer, resulting in a heap buffer over-read. OpenSSL command-line tools are not affected because BIO-layer checks prevent malformed data from reaching the vulnerable code path. The issue does not affect 32-bit platforms or 64-bit Windows, and the affected code is outside the OpenSSL FIPS module boundary.
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No public exploit code observed for this vulnerability.
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29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability addressed in Alpine Linux 3.22.5 and 3.23.5 as part of the June 9, 2026 OpenSSL advisory.
An OpenSSL vulnerability addressed in Alpine Linux 3.24.1 as part of the June 9, 2026 advisory.
A low-severity OpenSSL heap buffer over-read in ASN.1 content parsing caused by integer truncation in the ASN.1 decoder when parsing oversized DER-encoded primitive elements, potentially causing denial of service or unintended memory reads.
A security vulnerability in OpenSSL fixed by updating OpenSSL to version 3.5.7; no further details are provided 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.