How severe is CVE-2026-41256?

CVE-2026-41256 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 high, and availability none.

Is CVE-2026-41256 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-2026-41256?

CVE-2026-41256 affects Jqlang Jq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41256?

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

Does CVE-2026-41256 have an EU (EUVD) identifier?

Yes. CVE-2026-41256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29162.

When was CVE-2026-41256 published?

CVE-2026-41256 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-41256

CVE-2026-41256 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-158.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29162
Weakness: CWE-158
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, Top-level jq programs loaded from a file with -f are truncated at the first embedded NUL byte on current upstream HEAD. A crafted filter file such as . followed by \x00 and arbitrary suffix compiles and executes as only the prefix before the NUL. This leaves jq with a post-CVE-2026-33948 prefix/full-buffer mismatch on the compilation path even though the JSON parser path has already been fixed.

Frequently asked questions

What is CVE-2026-41256?: jq is a command-line JSON processor. In 1.8.1 and earlier, Top-level jq programs loaded from a file with -f are truncated at the first embedded NUL byte on current upstream HEAD. A crafted filter file such as . followed by \x00 and arbitrary suffix compiles and executes as only the prefix before the NUL. This leaves jq with a post-CVE-2026-33948 prefix/full-buffer mismatch on the compilation path even though the JSON parser path has already been fixed.
How severe is CVE-2026-41256?: CVE-2026-41256 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 high, and availability none.
Is CVE-2026-41256 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-2026-41256?: CVE-2026-41256 affects Jqlang Jq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41256 have an EU (EUVD) identifier?: Yes. CVE-2026-41256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29162.
When was CVE-2026-41256 published?: CVE-2026-41256 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://github.com/jqlang/jq/security/advisories/GHSA-vf2h-chrj-q3fg

Affected products (1)

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

More vulnerabilities in Jqlang Jq

CVE-2026-32316 — High (CVSS 8.2): jq is a command-line JSON processor. An integer overflow vulnerability exists through version 1.8.1 within the…
CVE-2024-53427 — High (CVSS 8.1): decNumberCopy in decNumber.c in jq through 1.7.1 does not properly consider that NaN is interpreted as numeric, which…
CVE-2025-48060 — High (CVSS 7.5): jq is a command-line JSON processor. In versions up to and including 1.7.1, a heap-buffer-overflow is present in…
CVE-2023-49355 — High (CVSS 7.5): decToString in decNumber/decNumber.c in jq 88f01a7 has a one-byte out-of-bounds write via the " []-1.2e-1111111111"…
CVE-2026-49839 — High (CVSS 7.1): jq is a command-line JSON processor. Prior to 1.8.2,` jq --rawfile` can turn a handled oversized-string error into…
CVE-2026-39979 — Medium (CVSS 6.5): jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized()…

All CVEs affecting Jqlang Jq →

Other CWE-158 vulnerabilities

CVE-2025-47812 — Critical (CVSS 10.0): In Wing FTP Server before 7.4.4. the user and admin web interfaces mishandle '\0' bytes, ultimately allowing injection…
CVE-2025-14388 — Critical (CVSS 9.8): The PhastPress plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Read via null byte injection in all…
CVE-2025-55113 — Critical (CVSS 9.0): If the Access Control List is enforced by the Control-M/Agent and the C router is in use (default in Out-of-support…
CVE-2023-5719 — High (CVSS 8.8): The Crimson 3.2 Windows-based configuration tool allows users with administrative access to define new passwords for…
CVE-2009-1537 — High (CVSS 8.8): Unspecified vulnerability in the QuickTime Movie Parser Filter in quartz.dll in DirectShow in Microsoft DirectX 7.0…
CVE-2025-9648 — High (CVSS 8.7): A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial…

Browse all CWE-158 vulnerabilities →