{"id":"CVE-2026-123571","aliases":["RUSTSEC-2026-0488","GHSA-x962-5xwx-fr8x"],"title":"Integer underflow when reporting a malformed TSIG record","titleSource":"OSV","descriptionSource":"OSV","description":"When a TSIG record is decoded from the DNS wire format, its MAC length and \"other data\" length are checked against the end of the record data. If a check failed, the error value was built from `end_idx - decoder.index()`. For a malformed record the decoder can already be past `end_idx`, so this unsigned subtraction underflows.\n\nIn builds with overflow checks enabled (the `dev` profile by default) the underflow panics, so a peer that sends a crafted TSIG record can crash the process. In builds without overflow checks the result wraps and is only used in the returned error.\n\nThe fix returns a plain \"insufficient bytes\" error without the subtraction. It is in 0.26.2.","severity":"high","score":8.7,"published":"2026-09-03T12:00:00.000Z","modified":"2026-11-13T03:04:27.566Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"crates.io","name":"hickory-proto","sources":[{"name":"OSV · RUSTSEC-2026-0488","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0488"}],"ranges":[{"events":[{"introduced":"0.26.0"},{"fixed":"0.26.2"}],"type":"SEMVER"}],"versions":[],"fixed":["0.26.2"]}],"sourceAffected":[],"references":["https://crates.io/crates/hickory-proto","https://rustsec.org/advisories/RUSTSEC-2026-0488.html","https://github.com/hickory-dns/hickory-dns/commit/b1246a8a21b6dcc34d427a7d39dd96e10825c384","https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-x962-5xwx-fr8x","https://www.vulncheck.com/advisories/hickory-dns-from-0.26.0-before-0.26.2-panic-via-tsig-rdata-decoding"],"sources":[{"name":"OSV","id":"RUSTSEC-2026-0488","modified":"2026-11-12T09:45:02.534591336Z","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0488"},{"name":"CVE","id":"CVE-2026-123571","modified":"2026-11-13T03:04:27.566Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-123571"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"cve":{"records":[{"id":"CVE-2026-123571","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-06T00:53:14.313Z","published":"2026-11-08T01:38:08.593Z","modified":"2026-11-13T03:04:27.566Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-08T01:38:08.593Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-13T03:04:27.566Z"}],"references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-x962-5xwx-fr8x","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-from-0.26.0-before-0.26.2-panic-via-tsig-rdata-decoding","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-191","description":"Integer Underflow (Wrap or Wraparound)","source":"VulnCheck"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-13T03:04:18.930667Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"products":[{"vendor":"hickory-dns","name":"hickory-dns","platforms":[],"versions":[{"version":"0.26.0","status":"affected","lessThan":"0.26.2","versionType":"semver"},{"version":"0.26.2","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/hickory-proto","packageIdentity":{"ecosystem":"crates.io","name":"hickory-proto"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-123571"}],"remediation":[],"observedAt":"2026-11-13T06:57:20.345Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:45:32.170Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-08T02:45:37.739Z","attemptedAt":"2026-11-08T02:45:37.739Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-08T02:45:37.767Z","attemptedAt":"2026-11-08T02:45:37.767Z"},{"source":"EUVD","status":"no-result","checkedAt":"2026-11-08T02:45:38.483Z","attemptedAt":"2026-11-08T02:45:38.483Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-11-08T02:45:38.060Z","attemptedAt":"2026-11-08T02:45:38.060Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-123571","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123571","modified":"2026-11-08T02:16:49.990","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-08T02:45:37.739Z"},{"source":"NVD","id":"CVE-2026-123571","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123571","modified":"2026-11-08T02:16:49.990","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-08T02:45:37.739Z"}],"aiSummary":null}