CVE-2026-120455— rapidyaml through 0.16.0 Out-of-Bounds Write via ParseEngine::_add_annotation()

Quick assessment

Affected

biojppm rapidyaml

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.

rapidyaml 0.16.0 及更早版本在函数中存在越界写入漏洞。攻击者可通过提供包含过多锚点（anchors）或标签（tags）的 YAML 内容来破坏内存。具体而言，在发布版本（release builds）中，攻击者提交包含连续锚点或标签的 YAML 数据，可溢出固定的双元素注解数组，进而破坏栈内存并导致进程崩溃。

CVSS 6.1 · Medium Updated Nov 02, 2026

Possible ATT&CK Techniques 2 AI

T1068.002 T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
biojppm	rapidyaml	`≤ 0.16.0`	affected

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Vulnerability Information

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Vulnerability Title

rapidyaml through 0.16.0 Out-of-Bounds Write via ParseEngine::_add_annotation()

Source: CVE Program / CVE List V5

Vulnerability Description

rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存写

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
biojppm	rapidyaml	0 ~ 0.16.0	-

II. Public POCs for CVE-2026-120455

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-120455

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Other References for CVE-2026-120455 (7)

https://github.com/biojppm/rapidyaml/blob/v0.16.0/src/c4/yml/parse_engine.hpp#L249-L260 technical-description
https://github.com/biojppm/rapidyaml/blob/v0.16.0/src/c4/yml/parse_engine.def.hpp#L5524-L5535 technical-description
https://github.com/biojppm/rapidyaml/issues/680 issue-tracking
https://hackmd.io/@haindpwn/rapidyaml-parser-annotation-oob-write technical-description
https://github.com/biojppm/rapidyaml/blob/v0.16.0/src/c4/yml/parse_engine.def.hpp#L4307-L4351 technical-description
https://github.com/biojppm/rapidyaml/releases/tag/v0.16.0 release-notes
https://www.vulncheck.com/advisories/rapidyaml-through-0.16.0-out-of-bounds-write-via-parseengine-add-annotation third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120455

IV. Related Vulnerabilities

Same weakness: CWE-787