CVE-2026-39979
Estado: ModificadaMedia (6.9)—
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.
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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.
CVSS
- Versión: 4.0
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Puntuación base: 6.9
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.82%
- Percentil entre todas las CVEs puntuadas: 56
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-125
- CWE-125
Referencias
- https://github.com/jqlang/jq/commit/2f09060afab23fe9390cce7cb860b10416e1bf5f
- https://github.com/jqlang/jq/security/advisories/GHSA-2hhh-px8h-355p
- https://access.redhat.com/errata/RHSA-2026:16252
- https://access.redhat.com/errata/RHSA-2026:16692
- https://access.redhat.com/errata/RHSA-2026:16693
- https://access.redhat.com/errata/RHSA-2026:18040
- https://access.redhat.com/errata/RHSA-2026:18042
- https://access.redhat.com/errata/RHSA-2026:18043
- https://access.redhat.com/errata/RHSA-2026:18044
- https://access.redhat.com/errata/RHSA-2026:18045
- https://access.redhat.com/errata/RHSA-2026:18046
- https://access.redhat.com/errata/RHSA-2026:18047
- https://access.redhat.com/errata/RHSA-2026:18048
- https://access.redhat.com/errata/RHSA-2026:19151
- https://access.redhat.com/errata/RHSA-2026:19365
- https://access.redhat.com/errata/RHSA-2026:23233
- https://access.redhat.com/errata/RHSA-2026:23245
- https://access.redhat.com/errata/RHSA-2026:25044
- https://access.redhat.com/errata/RHSA-2026:25096
- https://access.redhat.com/errata/RHSA-2026:25181
- https://access.redhat.com/errata/RHSA-2026:26528
- https://access.redhat.com/errata/RHSA-2026:26542
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:30078
- https://access.redhat.com/errata/RHSA-2026:30087
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:30089
- https://access.redhat.com/errata/RHSA-2026:34098
- https://access.redhat.com/errata/RHSA-2026:8579
- https://access.redhat.com/security/cve/CVE-2026-39979
- https://bugzilla.redhat.com/show_bug.cgi?id=2458077
- https://github.com/jqlang/jq/security/advisories/GHSA-2hhh-px8h-355p
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39979.json
JSON original (NVD)
Mostrar
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