CVE Watch3 de nov. de 2026

CVE-2026-63476

isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git reads a server-controlle

CVSS

4.3

Média

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Publicado: 3 de nov. de 2026 · Última mod.: 3 de nov. de 2026 · CWE-400 · CWE-789

EPSS · 30d

0.3%EPSS · 30 dias0.3%

2026-11-042026-11-05

Descrição técnica

isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git reads a server-controlled targetSize while applying a packfile delta in src/utils/applyDelta.js and passes it without a bound to Buffer.alloc(targetSize). A malicious or man-in-the-middle-controlled remote can send one delta header that causes git.clone() or git.fetch() to allocate approximately 2 GB before validating the actual delta output. GitPackIndex.fromPack swallows the later size-mismatch error, so a host with sufficient memory may retain the resource waste without a visible failure, while containers, serverless functions, and small virtual machines may terminate. Node.js heap limits do not mitigate the off-heap Buffer allocation. This issue is fixed in version 1.38.6.

Referências oficiais

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