CURL-CVE-2026-13608

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Source
https://curl.se/docs/CVE-2026-13608.html
Import Source
https://curl.se/docs/CURL-CVE-2026-13608.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-13608
Aliases
Published
2026-09-02T08:00:00Z
Modified
2026-09-07T14:06:31Z
Summary
OpenLDAP SASL authentication bypass
Details

A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.

Database specific 
{
    "CWE":  {
        "desc":  "Improper Restriction of Communication Channel to Intended Endpoints",
        "id":  "CWE-923"
    },
    "URL":  "https://curl.se/docs/CVE-2026-13608.json",
    "affects":  "both",
    "issue":  "https://hackerone.com/reports/3822248",
    "last_affected":  "8.21.0",
    "package":  "curl",
    "severity":  "Low",
    "www":  "https://curl.se/docs/CVE-2026-13608.html"
}
Credits
    • Eunsoo Kim (Autonomous Code Security team at Microsoft) - FINDER
    • Eunsoo Kim - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.82.0
Fixed
8.22.0
Type
SEMVER
Events
Introduced
7.82.0
Fixed
8.20.1
Type
SEMVER
Events
Introduced
7.82.0
Fixed
8.16.1
Type
SEMVER
Events
Introduced
7.82.0
Fixed
8.14.2
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
eeca818b1e8d1e61c2d4d833aed56ce4c510a9d4
Fixed
ea71c3b6b60e563651ea8596a975aef0c8199519

Affected versions

7.*
7.82.0
7.83.0
7.83.1
7.84.0
7.85.0
7.86.0
7.87.0
7.88.0
7.88.1
8.*
8.0.0
8.0.1
8.1.0
8.1.1
8.1.2
8.10.0
8.10.1
8.11.0
8.11.1
8.12.0
8.12.1
8.13.0
8.14.0
8.14.1
8.15.0
8.16.0
8.17.0
8.18.0
8.19.0
8.2.0
8.2.1
8.20.0
8.21.0
8.3.0
8.4.0
8.5.0
8.6.0
8.7.0
8.7.1
8.8.0
8.9.0
8.9.1
Other
curl-7_82_0
curl-7_83_0
curl-7_83_1
curl-7_84_0
curl-7_85_0
curl-7_86_0
curl-7_87_0
curl-7_88_0
curl-7_88_1
curl-8_0_0
curl-8_0_1
curl-8_10_0
curl-8_10_1
curl-8_11_0
curl-8_11_1
curl-8_12_0
curl-8_12_1
curl-8_13_0
curl-8_14_0
curl-8_14_1
curl-8_15_0
curl-8_16_0
curl-8_17_0
curl-8_18_0
curl-8_19_0
curl-8_1_0
curl-8_1_1
curl-8_1_2
curl-8_20_0
curl-8_21_0
curl-8_2_0
curl-8_2_1
curl-8_3_0
curl-8_4_0
curl-8_5_0
curl-8_6_0
curl-8_7_0
curl-8_7_1
curl-8_8_0
curl-8_9_0
curl-8_9_1
rc-8_18_0-1
rc-8_18_0-2
rc-8_18_0-3
rc-8_19_0-1
rc-8_19_0-2
rc-8_19_0-3
rc-8_20_0-1
rc-8_20_0-2
rc-8_20_0-3
rc-8_21_0-1
rc-8_21_0-2
rc-8_21_0-3
tiny-curl-8_4_0

Database specific

source 
"https://curl.se/docs/CURL-CVE-2026-13608.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "326639408536088429782387452173430813488",
                "309793192306506390906797793866759243868",
                "25094943265867132959496315694728531457",
                "131351165008478471621245708616349825336",
                "194811653429796140974907197863500476284"
            ],
            "threshold":  0.9
        },
        "id":  "CURL-CVE-2026-13608-2ddb3aa2",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/ea71c3b6b60e563651ea8596a975aef0c8199519",
        "target":  {
            "file":  "lib/openldap.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "241857058883287100469178053667771510182",
            "length":  713
        },
        "id":  "CURL-CVE-2026-13608-cc8eade8",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/ea71c3b6b60e563651ea8596a975aef0c8199519",
        "target":  {
            "file":  "lib/openldap.c",
            "function":  "oldap_state_sasl_resp"
        }
    }
]
vanir_signatures_modified 
"2026-09-07T14:06:31Z"