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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-40890— github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer

Quick assessment

Affected
gomarkdown markdown
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.

Markdown是gomarkdown开源的一个用于解析 Markdown 文本并渲染为 HTML 的 Go 库。 markdown存在安全漏洞，该漏洞源于使用SmartypantsRenderer处理包含<字符但后续文本中无>字符的畸形输入时，可能导致越界读取或程序崩溃。

CVSS 7.5 · High EPSS 0.52% · P43
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-40890

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer
Source: CVE Program / CVE List V5
Vulnerability Description
The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Markdown 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Markdown是gomarkdown开源的一个用于解析 Markdown 文本并渲染为 HTML 的 Go 库。 markdown存在安全漏洞，该漏洞源于使用SmartypantsRenderer处理包含<字符但后续文本中无>字符的畸形输入时，可能导致越界读取或程序崩溃。
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
gomarkdown markdown < 759bbc3e32073c3bc4e25969c132fc520eda2778 -

II. Public POCs for CVE-2026-40890

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-40890

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-40890 (1)

IV. Related Vulnerabilities

Same product: markdown
Same vendor: gomarkdown
Same weakness: CWE-125

V. Comments for CVE-2026-40890

No comments yet

Leave a comment