CVE-2026-54679: jq: potential integer overflow in jvp_string_append

mediumCVSS 5.5CVE-2026-54679

CSIRTS triage

Other

What: A potential integer overflow vulnerability exists in jq's string append function.
Who is affected: Systems using jq are affected by this vulnerability.
Urgency: Remediation is medium priority due to the CVSS score of 5.5 indicating moderate risk.
Action: Apply the relevant updates to address CVE-2026-54679.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54679

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-546790.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54679	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] jq: Vulnerability allows unspecified attackcert-bund

Recent advisories for jq

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Red Hat Hardened Images RPMs (jq and pyOpenSSL): Multiple vulnerabilitiescert-bund · 2026-07-09
medium[UPDATE] [medium] jq: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-07-08
medium[UPDATE] [medium] jq: Vulnerability allows denial of servicecert-bund · 2026-07-08
medium[UPDATE] [medium] jq: Vulnerability allows unspecified attackcert-bund · 2026-07-02
high[UPDATE] [high] jq: Multiple vulnerabilitiescert-bund · 2026-07-02
medium[UPDATE] [medium] jq: Vulnerability allows bypassing security measurescert-bund · 2026-07-02