CVE-2026-33948: jq is a command-line JSON processor

Q: How do I fix CVE-2026-33948?

jq: upgrade to 1.8.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-33948 being exploited?

CVE-2026-33948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33948 affect?

CVE-2026-33948 affects jq. Severity is medium (CVSS 5.3). jq is a command-line JSON processor. Commits before 6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b contain a vulnerability where CLI input parsing allows validation bypass via embedded NUL bytes. When reading JSON from files or stdin, jq uses str

Q: How urgent is CVE-2026-33948?

Priority 33/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-33948 is a medium-severity flaw (CVSS 5.3) affecting jq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

jq is a command-line JSON processor. Commits before 6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b contain a vulnerability where CLI input parsing allows validation bypass via embedded NUL bytes. When reading JSON from files or stdin, jq uses strlen() to determine buffer length instead of the actual byte count from fgets(), causing it to truncate input at the first NUL byte and parse only the preceding prefix. This enables an attacker to craft input wi

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-20, CWE-170
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: jqlang

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 00:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

jqlang jq UPGRADE

Affected: < 1.8.2

Fixed in: 1.8.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jq || rpm -q jq || jq --version

2. UPGRADE to 1.8.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jq

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jq

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33948?

jq: upgrade to 1.8.2. Exact commands for each OS are on this page.

Is CVE-2026-33948 being exploited?

CVE-2026-33948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33948 affect?

CVE-2026-33948 affects jq. Severity is medium (CVSS 5.3). jq is a command-line JSON processor. Commits before 6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b contain a vulnerability where CLI input parsing allows validation bypass via embedded NUL bytes. When reading JSON from files or stdin, jq uses str

How urgent is CVE-2026-33948?

Priority 33/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-32316 HIGH 8.2 UPGRADE jq is a command-line JSON processor
CVE-2026-39979 MEDIUM 6.5 UPGRADE UPGRADE jq is a command-line JSON processor
CVE-2026-33947 MEDIUM 6.2 UPGRADE jq is a command-line JSON processor
CVE-2026-39956 MEDIUM 6.1 UPGRADE jq is a command-line JSON processor
CVE-2026-43894 MEDIUM 6.2 UPGRADE jq is a command-line JSON processor

References

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