How severe is CVE-2026-43894?

CVE-2026-43894 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-43894 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43894?

CVE-2026-43894 affects Jqlang Jq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43894?

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

Does CVE-2026-43894 have an EU (EUVD) identifier?

Yes. CVE-2026-43894 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29172.

When was CVE-2026-43894 published?

CVE-2026-43894 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-43894

CVE-2026-43894 is a medium-severity vulnerability in Jqlang Jq with a CVSS 3.x base score of 6.2. 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 6.2)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29172
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, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).

Frequently asked questions

What is CVE-2026-43894?: jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).
How severe is CVE-2026-43894?: CVE-2026-43894 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-43894 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43894?: CVE-2026-43894 affects Jqlang Jq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43894?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43894 have an EU (EUVD) identifier?: Yes. CVE-2026-43894 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29172.
When was CVE-2026-43894 published?: CVE-2026-43894 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g

Affected products (1)

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

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