CVE catalog
CVE-2026-54430
liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches
- Severity
- Medium · CVSS 5.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.17% · Oct 25, 2026
liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | liboauth2 | sid | 2.4.0-1 | fixed |
| Debian | liboauth2 | forky | 2.4.0-1 | fixed |
| Debian | liboauth2 | trixie | 2.1.0-2 | vulnerable |
| Debian | liboauth2 | bookworm | 1.4.5.4-1 | not affected |
| Cpe | liboauth2 | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | liboauth2 | source | sid | 2.3.0-1 | not yet assigned | Not reported | Not reported |
| Debian | liboauth2 | source | forky | 2.3.0-1 | not yet assigned | Not reported | Not reported |
| Debian | liboauth2 | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | liboauth2 | source | bookworm | Not affected | unimportant | Not reported | Not reported |
Notes
[trixie] liboauth2: Minor issue
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [liboauth2-0]Affected
Source package: [liboauth2]
Details (2)
2.1.0-2· amd64 · trixieAffected
nvd · liboauth2 · debian · 13
2.1.0-2· arm64 · trixieAffected
nvd · liboauth2 · debian · 13
- [liboauth2-apache0]Affected
Source package: [liboauth2]
Details (2)
2.1.0-2· amd64 · trixieAffected
nvd · liboauth2 · debian · 13
2.1.0-2· arm64 · trixieAffected
nvd · liboauth2 · debian · 13
- [liboauth2-apache-dev]Affected
Source package: [liboauth2]
Details (2)
2.1.0-2· amd64 · trixieAffected
nvd · liboauth2 · debian · 13
2.1.0-2· arm64 · trixieAffected
nvd · liboauth2 · debian · 13
- [liboauth2-dev]Affected
Source package: [liboauth2]
Details (2)
2.1.0-2· amd64 · trixieAffected
nvd · liboauth2 · debian · 13
2.1.0-2· arm64 · trixieAffected
nvd · liboauth2 · debian · 13
[Debian 12 (Bookworm)]
- [liboauth2-0]Not affected
Source package: [liboauth2]
Details (2)
1.4.5.4-1· amd64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
1.4.5.4-1· arm64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
- [liboauth2-apache0]Not affected
Source package: [liboauth2]
Details (2)
1.4.5.4-1· amd64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
1.4.5.4-1· arm64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
- [liboauth2-apache-dev]Not affected
Source package: [liboauth2]
Details (2)
1.4.5.4-1· amd64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
1.4.5.4-1· arm64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
- [liboauth2-dev]Not affected
Source package: [liboauth2]
Details (2)
1.4.5.4-1· amd64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
1.4.5.4-1· arm64 · bookwormNot affected
nvd · liboauth2 · debian · bookworm
Observed:
References
- [https://cert.pl/en/posts/2026/07/CVE-2026-54430]
- [https://github.com/OpenIDC/liboauth2]
- [https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54430]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54430]
- [https://security-tracker.debian.org/tracker/CVE-2026-54430]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54430.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]