CVE catalog

CVE-2026-39956

jq is a command-line JSON processor. Prior to version 1.8.2, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and

[CVE catalog]

Severity: Medium · CVSS 6.1CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Published: Apr 13, 2026, 10:10:18 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.17% · Oct 25, 2026

jq is a command-line JSON processor. Prior to version 1.8.2, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and jv_string_indexes() in src/jv.c relies solely on assert() checks that are stripped in release builds compiled with -DNDEBUG. This allows an attacker to crash jq trivially with input like _strindices(0), and by crafting a numeric value whose IEEE-754 bit pattern maps to a chosen pointer, achieve a controlled pointer dereference and limited memory read/probe primitive. Any deployment that evaluates untrusted jq filters against a release build is vulnerable. This issue has been patched in commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03, which is part of version 1.8.2.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	jq	sid	`1.8.2-1`	fixed
Debian	jq	forky	`1.8.2-1`	fixed
Debian	jq	trixie	`1.7.1-6+deb13u3`	fixed
Debian	jq	trixie-security	`1.7.1-6+deb13u4`	fixed
Debian	jq	bookworm	`1.6-2.1+deb12u2`	fixed
Debian	jq	bookworm-security	`1.6-2.1+deb12u3`	fixed
Cpe	jq	Not reported	`1.7.1-3ubuntu0.24.04.2`	fixed
Cpe	libjq-dev	Not reported	`1.7.1-3ubuntu0.24.04.2`	fixed
Cpe	libjq1	Not reported	`1.7.1-3ubuntu0.24.04.2`	fixed
Cpe	jq	Not reported	`2026-04-08`	fixed
Cpe	jq	Not reported	`1.6-2.1+deb12u2`	fixed
Cpe	jq	Not reported	`2026-04-08`	fixed
Alpine	jq	3.22	`1.8.2-r0`	fixed
Alpine	jq	3.23	`1.8.2-r0`	fixed
Alpine	jq	3.24	`1.8.2-r0`	fixed
Ubuntu	jq	pro	`1.5+dfsg-2build1`	vulnerable
Ubuntu	jq	pro	`1.6-1`	vulnerable
Ubuntu	jq	pro	`1.6-1ubuntu0.20.04.1`	vulnerable
Ubuntu	jq	pro	`1.6-1ubuntu0.20.04.1+esm1`	vulnerable
Ubuntu	jq	pro	`1.6-1ubuntu0.20.04.1+esm2`	fixed
Ubuntu	jq	22.04	`1.6-2.1ubuntu2`	vulnerable
Ubuntu	jq	22.04	`1.6-2.1ubuntu3`	vulnerable
Ubuntu	jq	22.04	`1.6-2.1ubuntu3.1`	vulnerable
Ubuntu	jq	22.04	`1.6-2.1ubuntu3.2`	fixed
Ubuntu	jq	24.04	`1.6-3`	vulnerable
Ubuntu	jq	24.04	`1.7-1`	vulnerable
Ubuntu	jq	24.04	`1.7.1-2`	vulnerable
Ubuntu	jq	24.04	`1.7.1-3`	vulnerable
Ubuntu	jq	24.04	`1.7.1-3build1`	vulnerable
Ubuntu	jq	24.04	`1.7.1-3ubuntu0.24.04.1`	vulnerable
Ubuntu	jq	24.04	`1.7.1-3ubuntu0.24.04.2`	fixed
Ubuntu	jq	25.10	`1.7.1-3ubuntu1`	vulnerable
Ubuntu	jq	25.10	`1.7.1-6ubuntu1`	vulnerable
Ubuntu	jq	25.10	`1.8.1-3ubuntu1`	vulnerable
Ubuntu	jq	25.10	`1.8.1-3ubuntu1.1`	fixed
Ubuntu	jq	26.04	`1.8.1-3ubuntu1`	vulnerable
Ubuntu	jq	26.04	`1.8.1-4ubuntu1`	vulnerable
Ubuntu	jq	26.04	`1.8.1-4ubuntu2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	jq	source	sid	`1.8.1-5`	not yet assigned	Not reported	[1133921]
Debian	jq	source	forky	`1.8.1-5`	not yet assigned	Not reported	[1133921]
Debian	jq	source	trixie	`1.7.1-6+deb13u2`	not yet assigned	Not reported	[1133921]
Debian	jq	source	bookworm	`1.6-2.1+deb12u2`	not yet assigned	Not reported	[1133921]
Cpe	jq	cpe	Not reported	`1.7.1-3ubuntu0.24.04.2`	Not reported	Not reported	Not reported
Cpe	libjq-dev	cpe	Not reported	`1.7.1-3ubuntu0.24.04.2`	Not reported	Not reported	Not reported
Cpe	libjq1	cpe	Not reported	`1.7.1-3ubuntu0.24.04.2`	Not reported	Not reported	Not reported
Cpe	jq	cpe	Not reported	`2026-04-08`	Not reported	Not reported	Not reported
Cpe	jq	cpe	Not reported	`1.6-2.1+deb12u2`	Not reported	Not reported	Not reported
Cpe	jq	cpe	Not reported	`2026-04-08`	Not reported	NVD-CVE-2026-39956	Not reported
Alpine	jq	apk	3.22	`1.8.2-r0`	Not reported	ALPINE-CVE-2026-39956	Not reported
Alpine	jq	apk	3.23	`1.8.2-r0`	Not reported	ALPINE-CVE-2026-39956	Not reported
Alpine	jq	apk	3.24	`1.8.2-r0`	Not reported	ALPINE-CVE-2026-39956	Not reported
Ubuntu	jq	deb	pro	`1.6-1ubuntu0.20.04.1+esm2`	Not reported	UBUNTU-CVE-2026-39956	Not reported
Ubuntu	jq	deb	22.04	`1.6-2.1ubuntu3.2`	Not reported	UBUNTU-CVE-2026-39956	Not reported
Ubuntu	jq	deb	24.04	`1.7.1-3ubuntu0.24.04.2`	Not reported	UBUNTU-CVE-2026-39956	Not reported
Ubuntu	jq	deb	25.10	`1.8.1-3ubuntu1.1`	Not reported	UBUNTU-CVE-2026-39956	Not reported
Ubuntu	jq	deb	26.04	`1.8.1-4ubuntu2`	Not reported	UBUNTU-CVE-2026-39956	Not reported

[Debian bug #1133921]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[jq]Fixed
Details (4)
- 1.6-2.1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
[libjq1]Fixed
Source package: [jq]
Details (4)
- 1.6-2.1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
[libjq-dev]Fixed
Source package: [jq]
Details (4)
- 1.6-2.1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12
- 1.6-2.1+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 1.6-2.1+deb12u2
  nvd · jq · debian · bookworm; nvd · jq · debian · 12

[Debian 13 (Trixie)]

[jq]Fixed
Details (5)
- 1.7.1-6+deb13u2 · amd64 · trixie
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u2 · arm64 · trixie
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u3 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u3 · arm64 · trixie-security
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u4 · amd64 · trixie-security
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
[libjq1]Fixed
Source package: [jq]
Details (5)
- 1.7.1-6+deb13u2 · amd64 · trixie
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u2 · arm64 · trixie
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u3 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u3 · arm64 · trixie-security
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u4 · amd64 · trixie-security
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
[libjq-dev]Fixed
Source package: [jq]
Details (5)
- 1.7.1-6+deb13u2 · amd64 · trixie
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u2 · arm64 · trixie
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u3 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u3 · arm64 · trixie-security
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13
- 1.7.1-6+deb13u4 · amd64 · trixie-security
  Fixed · Fixed: 1.7.1-6+deb13u2
  nvd · jq · debian · 13

Observed: Oct 27, 2026, 7:59:09 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]