LOWRubyGems →
Sinatra is vulnerable to ReDoS through ETag header value generation
Sinatra is vulnerable to ReDoS through ETag header value generation
Affected packages
- sinatra— before 4.2.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/sinatra/sinatra/security/advisories/GHSA-mr3q-g2mv-mr4q
- https://nvd.nist.gov/vuln/detail/CVE-2025-61921
- https://github.com/sinatra/sinatra/issues/2120
- https://github.com/sinatra/sinatra/pull/1823
- https://github.com/sinatra/sinatra/pull/2121
- https://github.com/sinatra/sinatra/commit/3fe8c38dc405586f7ad8f2ac748aa53e9c3615bd
- https://github.com/sinatra/sinatra/commit/8ff496bd4877520599e1479d6efead39304edceb
- https://bugs.ruby-lang.org/issues/19104
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sinatra/CVE-2025-61921.yml
- https://github.com/sinatra/sinatra
Structured record: https://osv.dev/vulnerability/GHSA-mr3q-g2mv-mr4q
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