CVE-2025-68156: Expr is an expression language and expression evaluation for Go

Q: How do I fix CVE-2025-68156?

expr: upgrade to 1.17.7. Exact commands for each OS are on this page.

Q: Is CVE-2025-68156 being exploited?

CVE-2025-68156 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-2025-68156 affect?

CVE-2025-68156 affects expr. Severity is high (CVSS 7.5). Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data struct

Q: How urgent is CVE-2025-68156?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2025-68156 is a high-severity flaw (CVSS 7.5) affecting expr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data structures without enforcing a maximum recursion depth. If the evaluation environment contains deeply nested or cyclic data structures, these functions may recurse indefinitely until exceed the Go runtime stack limit

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-12-16
Last modified	2026-10-13

Publisher (CNA): GitHub, Inc. · Vendor: expr-lang

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-16 19:16 UTCPublished CVE record published
2026-10-13 11:10 UTCUpdated Record last modified

expr-lang expr UPGRADE

Affected: < 1.17.7

Fixed in: 1.17.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.17.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade expr

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-2025-68156?

expr: upgrade to 1.17.7. Exact commands for each OS are on this page.

Is CVE-2025-68156 being exploited?

CVE-2025-68156 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-2025-68156 affect?

CVE-2025-68156 affects expr. Severity is high (CVSS 7.5). Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data struct

How urgent is CVE-2025-68156?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

References

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