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CVE-2026-39979 is an out-of-bounds read in jq's libjq jv_parse_sized() API. Although the API accepts a buffer and explicit length, its malformed-JSON error-handling path formats the supplied buffer as a NUL-terminated string rather than respecting that length. A malformed JSON input held in a non-NUL-terminated buffer can therefore cause the parser to read beyond the buffer boundary while constructing an error message.
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jv_parse_sized() is NUL-terminated, including buffers carrying untrusted input. Avoid exposing raw parser error messages to untrusted users where feasible, as those messages may contain memory read beyond the supplied buffer.Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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47 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A jq out-of-bounds read vulnerability in jv_parse_sized() triggered during error formatting for non-NUL-terminated buffers.
An out-of-bounds read vulnerability in jq's jv_parse_sized() during error formatting for non-NUL-terminated buffers.
A jq out-of-bounds read vulnerability in jv_parse_sized() triggered during error formatting for non-NUL-terminated buffers.
An out-of-bounds read vulnerability in jq's jv_parse_sized() during error formatting for non-NUL-terminated buffers.
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.