Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
💎 RubyGems
Not in CISA KEV

GHSA-pcqq-5962-hvcw

Fix: ua-parser/uap-ruby@2bb1826

GHSA-pcqq-5962-hvcw is a security vulnerability in user_agent_parser. O3 Security confirms whether GHSA-pcqq-5962-hvcw is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

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

Published
Mar 10, 2020
Updated
May 22, 2025
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of May 22, 2025 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
💎user_agent_parser

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
💎RubyGemsuser_agent_parserall versions2.6.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for user_agent_parser. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update user_agent_parser to 2.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pcqq-5962-hvcw is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-pcqq-5962-hvcw is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-pcqq-5962-hvcw. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### 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
O3 Security · Impact-Aware SCA

Is GHSA-pcqq-5962-hvcw in your dependencies?

O3 detects GHSA-pcqq-5962-hvcw across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-pcqq-5962-hvcw: user_agent_parser… | O3 Security