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CVE-2026-80255— secure cookie attribute bypass with tab

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 8.21.0版本、8.20.0版本、8.19.0版本、8.18.0版本、8.17.0版本、8.16.0版本、8.15.0版本、8.14.1版本、8.14.0版本和8.13.0版本存在信息泄露漏洞，该漏洞源于Set-Cookie头中Secure属性前使用制表符而非空格，导致curl存储Cookie时未设置Secure标志，可能使Cookie在后续请求中通过明文HTTP发送。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1013

Affected Version Matrix 15

VendorProduct Version RangeStatus
curl curl 8.13.0< 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
1aea05a6c2699e80c75936d58569851555acd603< 4f6aa41a0145e930e766775dbe860883d350aa0a affected
8.21.0 affected
8.20.0 affected
8.19.0 affected
… +7 more rows
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I. Basic Information for CVE-2026-80255

Vulnerability Information
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Vulnerability Title
secure cookie attribute bypass with tab
Source: CVE Program / CVE List V5
Vulnerability Description
A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of space (ascii code 32) immediately before the `Secure` attribute causes curl to store the cookie without its Secure flag. The cookie might then wrongfully be sent over plaintext HTTP on subsequent requests to the same host.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
curl 信息泄露漏洞
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 8.21.0版本、8.20.0版本、8.19.0版本、8.18.0版本、8.17.0版本、8.16.0版本、8.15.0版本、8.14.1版本、8.14.0版本和8.13.0版本存在信息泄露漏洞，该漏洞源于Set-Cookie头中Secure属性前使用制表符而非空格，导致curl存储Cookie时未设置Secure标志，可能使Cookie在后续请求中通过明文HTTP发送。
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 8.13.0 ~ 8.14.2 -
curl curl 1aea05a6c2699e80c75936d58569851555acd603 ~ 4f6aa41a0145e930e766775dbe860883d350aa0a -
curl curl 8.21.0 -

II. Public POCs for CVE-2026-80255

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III. Intelligence Information for CVE-2026-80255

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Vendor Advisories for CVE-2026-80255 (2)

Proof of Concept for CVE-2026-80255 (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-2026-13608 OpenLDAP SASL authentication bypass

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-201

V. Comments for CVE-2026-80255

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