Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-54287— Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice

Quick assessment

Affected
honojs hono
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.

honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在输出处理不当漏洞，该漏洞源于Set-Cookie标头合并处理不当，可能导致客户端无法正确解析cookie。

CVSS 5.3 · Medium EPSS 0.31% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.25 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-54287

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes (for example Expires dates), clients cannot split the value back into individual cookies and silently drop or misparse them. This vulnerability is fixed in 4.12.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
honojs hono 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在输出处理不当漏洞，该漏洞源于Set-Cookie标头合并处理不当，可能导致客户端无法正确解析cookie。
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
honojs hono < 4.12.25 -

II. Public POCs for CVE-2026-54287

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-54287

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-54287 (1)

Same Patch Batch · honojs · 2026-06-22 · 5 CVEs total

CVE-2026-54290 7.1 HIGH Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the w
CVE-2026-54288 6.5 MEDIUM Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`
CVE-2026-54286 5.9 MEDIUM Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)
CVE-2026-54289 4.8 MEDIUM Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-116

V. Comments for CVE-2026-54287

No comments yet

Leave a comment