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CVE-2026-41257

24
FAUCET Score

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.

First published: May 11, 2026Last modified: May 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.1CPE matchmatch criteria
cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.4MEDIUM

CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
PROOF_OF_CONCEPT
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.14%
Probability of exploitation in next 30 days
EPSS Percentile
3.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0014 is in the 5th percentile among its peer group of 5,758 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

microsoftpatch availablevia msrc
Product: 21297-17084Fixed in: 1.7.1-6
microsoftpatch availablevia msrc
Product: 21415-17084Fixed in: 1.7.1-6
microsoftpatch availablevia msrc
Product: azl3 jq 1.7.1-5 on Azure Linux 3.0Fixed in: 1.7.1-6
microsoftpatch availablevia msrc
Product: azl3 jq 1.7.1-6 on Azure Linux 3.0Fixed in: 1.7.1-6
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

microsoft2026-May/CVE-2026-41257Moderate

jq: Signed-int overflow in `stack_reallocate` (jq VM stack)

May 12, 2026

References

github.com / jqlang/jq/security/advisories/GHSA-4jm8-m363-4539
ExploitMitigationVendor Advisory