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CVE-2026-55165 Lemur : JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure

🗓️ 18 Aug 2026 18:49:59Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 51 Views

JWT verifier in Lemur pre-1.9.2 trusts attacker-supplied alg header, enabling algorithm confusion.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-55165
26 Jun 202600:35
–circl
cve
CVE
CVE-2026-55165
18 Aug 202618:49
–cve
euvd
EUVD
EUVD-2026-61146
18 Aug 202618:49
–euvd
github
Github Security Blog
Lemur: JWT verifier honors attacker-supplied alg, enabling ATO
25 Jun 202622:05
–github
mend
Mend
CVE-2026-55165
18 Aug 202618:49
–mend
nvd
NVD
CVE-2026-55165
18 Aug 202619:16
–nvd
osv_ghsa
osv_ghsa
GHSA-R9GP-7F88-9R54 Lemur: JWT verifier honors attacker-supplied alg, enabling ATO
25 Jun 202622:05
–osv_ghsa
osv_pysec
osv_pysec
PYSEC-2026-2589 Lemur: JWT verifier honors attacker-supplied alg, enabling ATO
13 Jul 202615:46
–osv_pysec
ptsecurity
Positive Technologies
PT-2026-52656
25 Jun 202600:00
–ptsecurity
ptsecurity
Positive Technologies
PT-2026-59244
13 Jul 202600:00
–ptsecurity
Rows per page
[
  {
    "vendor": "Netflix",
    "product": "lemur",
    "versions": [
      {
        "version": "< 1.9.2",
        "status": "affected"
      }
    ]
  }
]

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