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Vulnerability · Published Nov 2, 2026 · Assigned by VulnCheck

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

Medium 6.1

In plain English

A medium-severity out-of-bounds write in rapidyaml from biojppm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.1%top 98.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:26.04:LTSrapidyamlno fix listedUBUNTU-CVE-2026-120455
Ubuntu:26.10rapidyamlno fix listedUBUNTU-CVE-2026-120455

Affected products (as reported)

VendorProductVersions
biojppm rapidyaml 0 – through 0.16.0

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

References