140 lines
6.1 KiB
JSON
140 lines
6.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-55165",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-06-16T15:13:28.165Z",
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"datePublished": "2026-08-18T18:49:59.538Z",
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"dateUpdated": "2026-08-18T19:35:55.129Z"
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},
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"containers": {
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"cna": {
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"title": "Lemur : JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-347",
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"lang": "en",
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"description": "CWE-347: Improper Verification of Cryptographic Signature",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "HIGH",
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"attackVector": "NETWORK",
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"availabilityImpact": "NONE",
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"baseScore": 4.8,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "LOW",
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"integrityImpact": "LOW",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/Netflix/lemur/security/advisories/GHSA-r9gp-7f88-9r54",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/Netflix/lemur/security/advisories/GHSA-r9gp-7f88-9r54"
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},
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{
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"name": "https://github.com/Netflix/lemur/commit/89898e665beed044cf7bd5927dfaa484e55bf242",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/Netflix/lemur/commit/89898e665beed044cf7bd5927dfaa484e55bf242"
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},
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{
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"name": "https://github.com/Netflix/lemur/releases/tag/v1.9.2",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/Netflix/lemur/releases/tag/v1.9.2"
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}
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],
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"affected": [
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{
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"vendor": "Netflix",
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"product": "lemur",
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"versions": [
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{
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"version": "< 1.9.2",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-08-18T18:49:59.538Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "Lemur manages TLS certificate creation. Prior to 1.9.2, the JWT verifier in lemur/auth/service.py:130-137 used fetch_token_header to read header_data[\"alg\"] from an unverified token and passed that attacker-controlled value to decode_with_multiple_secrets. PyJWT 2.x rejects alg=none with the configured key, so the flaw is a defense-in-depth gap rather than a direct authentication bypass in the shipped configuration. The unpinned algorithm can become exploitable after an asymmetric-signing migration through algorithm confusion, and it weakens algorithm-based anomaly detection because the token chooses the recorded value. A separate disclosure of LEMUR_TOKEN_SECRET would also permit forged HS256 tokens, although that disclosure is an independent prerequisite. The fix introduces the server-controlled LEMUR_TOKEN_ALGORITHMS allowlist and defaults it to HS256. This issue is fixed in version 1.9.2."
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}
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],
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"source": {
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"advisory": "GHSA-r9gp-7f88-9r54",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/Netflix/lemur/security/advisories/GHSA-r9gp-7f88-9r54",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-18T19:35:36.998493Z",
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"id": "CVE-2026-55165",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-18T19:35:55.129Z"
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}
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}
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]
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}
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} |