CVE-2023-22485— cmark-gfm out-of-bounds read in validate_protocol
Quick assessment
Affected
github cmark-gfm
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.
cmark-gfm是CommonMark的 C 参考实现的扩展版本，是带有规范的 Markdown 语法的合理化版本。 cmark-gfm 0.29.0.gfm.7之前版本存在缓冲区错误漏洞。攻击者利用该漏洞越界读取访问“malloc”元数据。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2023-22485
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
cmark-gfm out-of-bounds read in validate_protocol
Source: CVE Program / CVE List V5
Vulnerability Description
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior 0.29.0.gfm.7, a crafted markdown document can trigger an out-of-bounds read in the `validate_protocol` function. We believe this bug is harmless in practice, because the out-of-bounds read accesses `malloc` metadata without causing any visible damage.This vulnerability has been patched in 0.29.0.gfm.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
cmark-gfm 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cmark-gfm是CommonMark的 C 参考实现的扩展版本，是带有规范的 Markdown 语法的合理化版本。 cmark-gfm 0.29.0.gfm.7之前版本存在缓冲区错误漏洞。攻击者利用该漏洞越界读取访问“malloc”元数据。
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
II. Public POCs for CVE-2023-22485
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2023-22485
请登录查看更多情报信息。
Vendor Advisories for CVE-2023-22485 (1)
-
https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr x_refsource_CONFIRM
IV. Related Vulnerabilities
Same product: cmark-gfm
-
CVE-2023-37463
Quadratic complexity bugs may lead to a denial of service -
CVE-2023-24824
Quadratic complexity may lead to a denial of service in cmar -
CVE-2023-26485
Quadratic complexity may lead to a denial of service in cmar -
CVE-2023-22486
cmark-gfm Quadratic complexity bug in handle_close_bracket m -
CVE-2023-22484
Inefficient Quadratic complexity bug in handle_pointy_brace
Same vendor: github
-
CVE-2026-96890
Server-Side Request Forgery vulnerability was identified in -
CVE-2026-103620
Missing authorization in GitHub Enterprise Server allowed re -
CVE-2026-75101
Authorization bypass vulnerability in GitHub Enterprise Serv -
CVE-2026-77912
Stored cross-site scripting vulnerability in GitHub Enterpri -
CVE-2026-77987
GitHub Enterprise Server notebook viewer vulnerable to Serve
Same weakness: CWE-125
-
CVE-2026-85968
Out-of-bounds read in Progress MarkLogic Server -
CVE-2026-109281
ImageMagick 7.1.0-21 before 7.1.2-32 Heap Buffer Over-Read v -
CVE-2026-109269
ImageMagick before 6.9.13-57 and 7.x before 7.1.2-32 Informa -
CVE-2026-109265
ImageMagick 7.1.1-7 before 7.1.2-32 Heap Buffer Over-Read vi -
CVE-2026-109253
FreeRDP 3.9.0 before 3.32.0 RDPEAR NDR Scalar Out-of-Bounds
V. Comments for CVE-2023-22485
No comments yet