{"cve":"CVE-2026-26275","nvd":{"published":"2026-02-19T22:16:46.493","modified":"2026-06-17T10:26:01.703","status":"Analyzed","description":"httpsig-hyper is a hyper extension for http message signatures. An issue was discovered in `httpsig-hyper` prior to version 0.0.23 where Digest header verification could incorrectly succeed due to misuse of Rust's `matches!` macro. Specifically, the comparison `if matches!(digest, _expected_digest)` treated `_expected_digest` as a pattern binding rather than a value comparison, resulting in unconditional success of the match expression. As a consequence, digest verification could incorrectly return success even when the computed digest did not match the expected value. Applications relying on Digest verification as part of HTTP message signature validation may therefore fail to detect message body modification. The severity depends on how the library is integrated and whether additional signature validation layers are enforced. This issue has been fixed in `httpsig-hyper` 0.0.23. The fix replaces the incorrect `matches!` usage with proper value comparison and additionally introduces constant-time comparison for digest verification as defense-in-depth. Regression tests have also been added to prevent reintroduction of this issue. Users are strongly advised to upgrade to the patched version. There is no reliable workaround without upgrading. Users who cannot immediately upgrade should avoid relying solely on Digest verification for message integrity and ensure that full HTTP message signature verification is enforced at the application layer.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-354","CWE-697"],"references":["https://github.com/junkurihara/httpsig-rs/commit/5533f596c650377e02f4aa9e3eb8dba591b87370","https://github.com/junkurihara/httpsig-rs/commit/65cbd19b395180a4bba09a89746c4b14ccb8d297","https://github.com/junkurihara/httpsig-rs/pull/14","https://github.com/junkurihara/httpsig-rs/pull/15","https://github.com/junkurihara/httpsig-rs/security/advisories/GHSA-7v42-g35v-xrch"],"products":["junkurihara:httpsig-hyper"],"source":"nvd","synced_at":"2026-10-19T22:23:35.260773158+00:00"},"epss":{"cve":"CVE-2026-26275","score":0.00184,"percentile":0.08004,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7v42-g35v-xrch","url":"https://osv.dev/vulnerability/GHSA-7v42-g35v-xrch","summary":"Improper Digest Verification in httpsig-hyper May Allow Message Integrity Bypass","modified":"2026-02-20T16:59:14.979005Z","packages":[{"ecosystem":"crates.io","name":"httpsig-hyper","purl":"pkg:cargo/httpsig-hyper","ranges":["<0.0.23"],"fixed":["0.0.23"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}