Giskard has a Regular Expression Denial of Service (ReDoS) in RegexMatching Check

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

1.0 · CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L · score source

EPSS

• CVE-2026-40319: 0.15% estimated exploitation activity in the next 30 days; percentile 4.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The RegexMatching check in the giskard-checks package passes a user-supplied regular expression pattern directly to Python's re.search() without any timeout, complexity guard, or pattern validation. An attacker who can control the regex pattern or the text being matched can craft inputs that trigger catastrophic backtracking in the regex engine, causing the process to hang indefinitely and denying service to all other operations. giskard-checks is a local developer testing library. Check definitions, including the pattern parameter, are provided in application code or configuration files and executed locally. Exploitation requires write access to a check definition and subsequent execution of the test suite. The absence of a regex timeout could cause availability issues in automated environments such as CI/CD pipelines. Affected component textmatching.py, line 457: re.search(pattern, text) Remediation Upgrade to giskard-checks = 1.0.2b1. Credit Giskard-AI thanks @dhabaleshwar…

Published by the source

14 Apr 2026, 23:13 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:40 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-rq2q-4r55-9877

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-rq2q-4r55-9877

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# Patch Next advisory brief: CVE-2026-40319

Advisory: Giskard has a Regular Expression Denial of Service (ReDoS) in RegexMatching Check
IDs: CVE-2026-40319, GHSA-rq2q-4r55-9877
Record: https://patchnext.com/advisories/cve-2026-40319 (revision 3, source checked 26 Oct 2026, 13:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 1.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: giskard-checks 1.0.2b1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI giskard-checks: affected <= 1.0.1b1; fixed in 1.0.2b1

## Suggested inspection (read-only)
- `python -m pip show giskard-checks`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on giskard-checks.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-rq2q-4r55-9877 (OSV record GHSA-rq2q-4r55-9877 lists affected ranges: PyPI giskard-checks >=0 <1.0.2b1 (fixed))
- Verified: https://github.com/advisories/GHSA-rq2q-4r55-9877 (GitHub-reviewed advisory GHSA-rq2q-4r55-9877 lists affected ranges: PyPI giskard-checks >=0 <=1.0.1b1)

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