CVE Explorer

CVE-2025-66506

Fulcio is a free-to-use certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.3, function identity.extractIssuerURL splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request with an (invalid) OIDC identity token in the payload containing many period characters, a call to extractIssuerURL incurs allocations to the tune of O(n) bytes (where n stands for the length

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2d22536ba933b0a514dbba515686fd217592146618add844100936639e60e963

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"fulcio","vendor":"sigstore","versions":[{"status":"affected","version":"< 1.8.3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:847841fa10d05b9b6230882ed6001316a23475fd38b008722bd5663b623481ea · sha256:56516494fd4f8b78… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:847841fa10d05b9b6230882ed6001316a23475fd38b008722bd5663b623481ea · sha256:56516494fd4f8b78… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-405","description":"CWE-405: Asymmetric Resource Consumption (Amplification)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:847841fa10d05b9b6230882ed6001316a23475fd38b008722bd5663b623481ea · sha256:56516494fd4f8b78… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/sigstore/fulcio/commit/765a0e57608b9ef390e1eeeea8595b9054c63a5a","tags":["x_refsource_MISC"],"url":"https://github.com/sigstore/fulcio/commit/765a0e57608b9ef390e1eeeea8595b9054c63a5a"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:847841fa10d05b9b6230882ed6001316a23475fd38b008722bd5663b623481ea · sha256:56516494fd4f8b78… · /containers/cna/references/1

{"name":"https://github.com/sigstore/fulcio/security/advisories/GHSA-f83f-xpx7-ffpw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sigstore/fulcio/security/advisories/GHSA-f83f-xpx7-ffpw"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:847841fa10d05b9b6230882ed6001316a23475fd38b008722bd5663b623481ea · sha256:56516494fd4f8b78… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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