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CVE-2026-39979VulnerabilityPublished

Red Hat Security Advisory: jq security update

Affects Red Hat jqSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-39979· Medium 6.9

Not known to be exploited · CVSS 6.9 Medium.

Data as of 11 Nov 2026, 15:33 UTC

CVSS 4.0 base score
6.9Medium
How severe the flaw is on the 0–10 CVSS scale.
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
jqlangjqAffected
  • =< 2f09060afab23fe9390cce7cb860b10416e1bf5f
Fixed in–

AI-suggested

Red Hat has released updated jq packages for Red Hat Enterprise Linux 10 and associated CodeReady Linux Builder products that address these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:98603 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation is required beyond applying the official patch.

Description

Two security vulnerabilities were identified in jq, a command-line JSON processor. The first is an out-of-bounds read in the jv_parse_sized() function triggered by error formatting for non-NUL-terminated buffers (CVE-2026-39979). The second is a denial of service vulnerability caused by crafted JSON objects that induce hash collisions (CVE-2026-40164). Red Hat has issued an important security update for jq in Red Hat Enterprise Linux 10 and related products to address these issues.

References

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