How severe is CVE-2026-41257?

CVE-2026-41257 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-41257 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41257?

CVE-2026-41257 affects Jqlang Jq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41257?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-41257 have an EU (EUVD) identifier?

Yes. CVE-2026-41257 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29163.

When was CVE-2026-41257 published?

CVE-2026-41257 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-41257

CVE-2026-41257 is a medium-severity vulnerability in Jqlang Jq with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v4: 6.4
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29163
Weakness: CWE-190
Affected product: Jqlang Jq
Published: 2026-05-11
Last modified: 2026-06-17

Description

jq is a command-line JSON processor. In 1.8.1 and earlier, the jq bytecode VM's data stack tracks its allocation size in a signed int. When the stack grows beyond ≈1 GiB (via deeply nested generator forks), the doubling arithmetic overflows. The wrapped value is passed to realloc and then used for a memmove with attacker-influenced offsets.

Frequently asked questions

What is CVE-2026-41257?: jq is a command-line JSON processor. In 1.8.1 and earlier, the jq bytecode VM's data stack tracks its allocation size in a signed int. When the stack grows beyond ≈1 GiB (via deeply nested generator forks), the doubling arithmetic overflows. The wrapped value is passed to realloc and then used for a memmove with attacker-influenced offsets.
How severe is CVE-2026-41257?: CVE-2026-41257 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-41257 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41257?: CVE-2026-41257 affects Jqlang Jq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41257?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41257 have an EU (EUVD) identifier?: Yes. CVE-2026-41257 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29163.
When was CVE-2026-41257 published?: CVE-2026-41257 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539

Affected products (1)

cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*

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