CVE-2026-54430

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Source
https://cve.org/CVERecord?id=CVE-2026-54430
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54430.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54430
Downstream
Published
2026-07-02T10:30:33Z
Modified
2026-08-12T16:41:13Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N CVSS Calculator
Summary
Server-Site Request Forgery in liboauth2
Details

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

Database specific 
{
    "cna_assigner":  "CERT-PL",
    "cwe_ids":  [
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54430.json"
}
References

Affected packages

Git / github.com/openidc/liboauth2

Affected ranges

Type
GIT
Repo
https://github.com/openidc/liboauth2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
347507ac5b51f48c2933bbe49b2ee07c2af4712b
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.3.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.0.0
v1.0.1
v1.1.0
v1.1.1
v1.3.0
v1.4.0
v1.4.0.1
v1.4.1
v1.4.2
v1.4.2.1
v1.4.3
v1.4.3.1
v1.4.3.2
v1.4.4
v1.4.4.1
v1.4.4.2
v1.4.5
v1.4.5.1
v1.4.5.2
v1.4.5.3
v1.4.5.4
v1.4.5.5
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v2.*
v2.0.0
v2.1.0
v2.1.1
v2.2.0
v2.2.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54430.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "310001169713942613343435151233392444484",
            "length":  1239
        },
        "id":  "CVE-2026-54430-082ea3a8",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/openidc/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b",
        "target":  {
            "file":  "src/jose.c",
            "function":  "oauth2_jose_jwks_aws_alb_resolve"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "300782311466481198031019369587407341335",
                "121593882326356607658898739081028212141",
                "144918086941886362552307221027761693930",
                "3618328312005784352581273794445680450",
                "199649873056629801079065975266881212353",
                "179262542926059421241759038069143382221",
                "71972938115036490850486121777060821154",
                "123276757899723470177019514006078774905",
                "263632559640752313388992170985475915768",
                "305138988736990169084066309097346446257",
                "11402096707507145550694885126300127758",
                "158025553772314100289543362685183048192",
                "104146115157386064007737405664140634588",
                "120773239811982707303597383826806095175",
                "68334545154680162432049627675389874689",
                "243027684613140417202696302056330927767",
                "315274418919029771893744850077596020271",
                "105387709087907887184981019173246142867",
                "157474443155713369137405672583884754564",
                "227704989154753889667959283309090548318"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-54430-62c42076",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/openidc/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b",
        "target":  {
            "file":  "src/jose.c"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T16:41:13Z"