XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115946
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-01 00:16:34 UTC
Updated2026-11-01 00:16:34 UTC
DescriptionXS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder. Affected versions compile a bundled brotli into static archives that dependent XS modules link against at build time, rather than using the system library. The bundled copy, 1.0.7 or 1.1.0 across the range, carries the decoder out-of-bounds write described in CVE-2026-111497. Version 1.2.1.0 updates it to brotli 1.2.1. XS::libbrotli has no Perl interface, so the decoder is reached through any dependent module that decompresses untrusted data with it. An attacker supplying a crafted brotli stream can corrupt decoder state, disclose memory, crash the process, or potentially execute arbitrary code. Upgrading the system brotli does not remediate this.

Risk And Classification

Problem Types: CWE-1395 CWE-1395 Dependency on Vulnerable Third-Party Component

References

ReferenceSourceLinkTags
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org
github.com/google/brotli/releases/tag/v1.2.1 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/SYBER/XS-libbrotli-1.2.1.0/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-10-29T00:00:00.000ZVersion 1.2.1.0 released with fix.

Solutions

CNA: Upgrade to XS-libbrotli 1.2.1.0 or later and reinstall every XS module built against it.

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