How severe is GHSA-pcqq-5962-hvcw?

No CVSS score has been assigned to GHSA-pcqq-5962-hvcw yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-pcqq-5962-hvcw?

GHSA-pcqq-5962-hvcw affects the following packages: user_agent_parser (RubyGems). Ecosystems affected: RubyGems.

How do I fix GHSA-pcqq-5962-hvcw?

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.

How do I detect GHSA-pcqq-5962-hvcw in my RubyGems dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for user_agent_parser, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-pcqq-5962-hvcw if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-pcqq-5962-hvcw actively exploited in the wild?

No public exploit code has been indexed for GHSA-pcqq-5962-hvcw yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-pcqq-5962-hvcw published, and has it been updated?

GHSA-pcqq-5962-hvcw was published on March 10, 2020 and was last updated on May 22, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎 RubyGems

Not in CISA KEV

Denial of Service in uap-core when processing crafted User-Agent stringsGHSA-pcqq-5962-hvcw

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

GHSA-pcqq-5962-hvcw is a security vulnerability in user_agent_parser. A fix is available for user_agent_parser — see the affected versions and patch details below.

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

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`user_agent_parser`	all versions	2.6.0`bundle update user_agent_parser --conservative`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for user_agent_parser, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

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

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