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Denial of Service in uap-core when processing crafted User-Agent strings

GHSA-pcqq-5962-hvcw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (user_agent_parser 2.6.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. Patches Please update uap-ruby to >= v2.6.0 For more information https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p Reported in uap-core by Ben Caller @bcaller

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-pcqq-5962-hvcw

Agent brief

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# Patch Next advisory brief: GHSA-pcqq-5962-hvcw

Advisory: Denial of Service in uap-core when processing crafted User-Agent strings
IDs: GHSA-pcqq-5962-hvcw
Record: https://patchnext.com/advisories/ghsa-pcqq-5962-hvcw (revision 1, source checked 26 Oct 2026, 15:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: user_agent_parser 2.6.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems user_agent_parser: affected < 2.6.0; fixed in 2.6.0

## Suggested inspection (read-only)
- RubyGems user_agent_parser: check the installed version with your package manager.

## 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 user_agent_parser.
- 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://github.com/advisories/GHSA-pcqq-5962-hvcw (GitHub-reviewed advisory GHSA-pcqq-5962-hvcw lists affected ranges: RubyGems user_agent_parser >=0 <2.6.0)

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