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CVE-2026-13608— OpenLDAP SASL authentication bypass

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

curl是瑞典curl团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl 7.82.0版本至8.21.0版本存在授权问题漏洞，该漏洞源于libcurl的LDAP身份验证中SASL协商过程存在缺陷，不完整的握手序列可能被误解为成功的加密验证，导致中间人攻击者能够注入提前或捷径响应，绕过完整的对等验证。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1557.003 · DHCP Spoofing

Affected Version Matrix 46

VendorProduct Version RangeStatus
curl curl 7.82.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.1 affected
8.21.0< 8.22.0 affected
eeca818b1e8d1e61c2d4d833aed56ce4c510a9d4< ea71c3b6b60e563651ea8596a975aef0c8199519 affected
8.21.0 affected
8.20.0 affected
8.19.0 affected
… +38 more rows
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I. Basic Information for CVE-2026-13608

Vulnerability Information
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Vulnerability Title
OpenLDAP SASL authentication bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5
Vulnerability Title
curl 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是瑞典curl团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl 7.82.0版本至8.21.0版本存在授权问题漏洞，该漏洞源于libcurl的LDAP身份验证中SASL协商过程存在缺陷，不完整的握手序列可能被误解为成功的加密验证，导致中间人攻击者能够注入提前或捷径响应，绕过完整的对等验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 7.82.0 ~ 8.14.2 -
curl curl eeca818b1e8d1e61c2d4d833aed56ce4c510a9d4 ~ ea71c3b6b60e563651ea8596a975aef0c8199519 -
curl curl 8.21.0 -

II. Public POCs for CVE-2026-13608

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-13608

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Vendor Advisories for CVE-2026-13608 (2)

Vendor Pages for CVE-2026-13608 (1)

Same Patch Batch · curl · 2026-09-06 · 9 CVEs total

CVE-2026-82208 wolfSSL CA-cache hit overrides callback
CVE-2026-82209 domain-scoped PSL domain cookie
CVE-2026-18924 HTTP/2 server push UAF
CVE-2026-19931 Negotiate ambient user conn reuse
CVE-2026-80231 native CA store conn reuse
CVE-2026-80229 OpenSSL provider use-after-free
CVE-2026-80230 OpenSSL pinning bypass
CVE-2026-80255 secure cookie attribute bypass with tab

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-923

V. Comments for CVE-2026-13608

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