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Vulnerability details: VCID-zafh-nuvx-6fch
Vulnerability ID VCID-zafh-nuvx-6fch
Aliases CVE-2026-27962
GHSA-wvwj-cvrp-7pv5
Summary authlib: Authlib: Authentication bypass due to JWK Header Injection vulnerability
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-347 Improper Verification of Cryptographic Signature
System Score Found at
cvssv3 9.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27962.json
epss 0.00081 https://api.first.org/data/v1/epss?cve=CVE-2026-27962
cvssv3.1 9.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 9.1 https://github.com/authlib/authlib
generic_textual CRITICAL https://github.com/authlib/authlib
cvssv3.1 9.1 https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681
generic_textual CRITICAL https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681
ssvc Track* https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681
cvssv3.1 9.1 https://github.com/authlib/authlib/releases/tag/v1.6.9
generic_textual CRITICAL https://github.com/authlib/authlib/releases/tag/v1.6.9
ssvc Track* https://github.com/authlib/authlib/releases/tag/v1.6.9
cvssv3.1 9.1 https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5
generic_textual CRITICAL https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5
ssvc Track* https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5
cvssv3.1 9.1 https://nvd.nist.gov/vuln/detail/CVE-2026-27962
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2026-27962
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27962.json
https://api.first.org/data/v1/epss?cve=CVE-2026-27962
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27962
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/authlib/authlib
https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681
https://github.com/authlib/authlib/releases/tag/v1.6.9
https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5
https://nvd.nist.gov/vuln/detail/CVE-2026-27962
2448164 https://bugzilla.redhat.com/show_bug.cgi?id=2448164
RHSA-2026:19375 https://access.redhat.com/errata/RHSA-2026:19375
RHSA-2026:5665 https://access.redhat.com/errata/RHSA-2026:5665
RHSA-2026:7314 https://access.redhat.com/errata/RHSA-2026:7314
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27962.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/authlib/authlib
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-03-17T12:43:23Z/ Found at https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/authlib/authlib/releases/tag/v1.6.9
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-03-17T12:43:23Z/ Found at https://github.com/authlib/authlib/releases/tag/v1.6.9
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-03-17T12:43:23Z/ Found at https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27962
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.24045
EPSS Score 0.00081
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:33:33.676750+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27962.json 38.6.0