Description
jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. The issue has been patched in commit 2f09060afab23fe9390cce7cb860b10416e1bf5f.
INFO
Published Date :
2026-04-13T22:18:56.252Z
Last Modified :
2026-04-14T13:43:15.227Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-39979 vulnerability.
| Vendors | Products |
|---|---|
| Jqlang |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-39979.
