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ruby-jwt: Empty-key HMAC bypass; cross-language sibling of CVE-2026-44351

🗓️ 18 May 2026 00:00:00Reported by RubySecType 
rubygems
 rubygems
🔗 rubysec.com👁 16 Views

Empty-key HMAC bypass permits forged JWTs with HS256 when key is empty or falsy.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-44351
13 May 202619:12
attackerkb
ATTACKERKB
CVE-2026-45363
14 Jul 202621:32
attackerkb
BDU FSTEC
The vulnerability of the JWT Ruby JWT implementation lies in the authentication process’s flaws, which allow attackers to trigger a service denial.
7 Jul 202600:00
bdu_fstec
Chainguard
CVE-2026-45363 vulnerabilities
26 May 202601:18
cgr
Circl
CVE-2026-44351
29 Apr 202611:07
circl
Circl
CVE-2026-45363
14 Jul 202622:16
circl
CNNVD
fast-jwt 授权问题漏洞
13 May 202600:00
cnnvd
CVE
CVE-2026-44351
13 May 202619:12
cve
CVE
CVE-2026-45363
14 Jul 202621:32
cve
Cvelist
CVE-2026-44351 fast-jwt: Empty HMAC secret accepted via async key resolver - JWT auth bypass
13 May 202619:12
cvelist
Rows per page
Vulners
Node
OR
rubyjwtRange2.10.02.10.3
rubyjwtRange3.2.0

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18 May 2026 00:00Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.19.1
EPSS0.00242
SSVC
16