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CVE-2023-42821— github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations

Quick assessment

Affected
gomarkdown markdown
Exploitation
Public or AI PoC available; prioritize validation
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。 gomarkdown/markdown 0.0.0-20230922105210-14b16010c2ee之前版本存在缓冲区错误漏洞，该漏洞源于使用parser.Mmark扩展的解析器解析格式错误的输入时会导致越界读取漏洞。

CVSS 7.5 · High EPSS 1.25% · P69

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-42821

Vulnerability Information
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Vulnerability Title
github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations
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. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.
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 缓冲区错误漏洞
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。 gomarkdown/markdown 0.0.0-20230922105210-14b16010c2ee之前版本存在缓冲区错误漏洞，该漏洞源于使用parser.Mmark扩展的解析器解析格式错误的输入时会导致越界读取漏洞。
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 < 0.0.0-20230922105210-14b16010c2ee -

II. Public POCs for CVE-2023-42821

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7628 chars
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III. Intelligence Information for CVE-2023-42821

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Patches & Fixes for CVE-2023-42821 (1)

Vendor Advisories for CVE-2023-42821 (1)

Other References for CVE-2023-42821 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-42821

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