Chrome: buffer overflow in Dawn

Chrome

Chrome 157.0.8103.38 contains a fix for a buffer overflow in Dawn, reported by Zhenpeng (Leo) Lin.

Do this now

Upgrade Chrome to 157.0.8103.38.

Fix it

Upgrade to Chrome 157.0.8103.38

First seen: 3 Nov 2026
Last update: 3 Nov 2026, 21:18 UTC
Fixed in: 157.0.8103.38
Identifiers: CVE-2026-121156
Source: news
On the menu as: Chrome

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Chrome: buffer overflow in Dawn
Severity: unknown. Patch status: patched.
Affected: Chrome
Fixed in: 157.0.8103.38
Ids: CVE-2026-121156

Chrome 157.0.8103.38 contains a fix for a buffer overflow in Dawn, reported by Zhenpeng (Leo) Lin.

## Steps
1. Search the repo, its CI and infra config for Chrome. If present, report the version in use and whether it's affected.
2. Fix by release line: Chrome: 157.0.x → 157.0.8103.38.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Chrome 157.0.x | fixed | 157.0.8103.38 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-121156") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: http://chromereleases.googleblog.com/2026/11/stable-channel-update-for-desktop.html
https://pwned.coffee/i/chrome-buffer-overflow-in-dawn-cve-2026-121156

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Chrome 157.0.8103.38 to before 157.0.8103.38 157.0.8103.38 CVE record (CNA) checked 3 Nov
Score: No CVSS published yet: severity unknown.
Last checked: 4 Nov 2026, 08:18 UTC

Product	Affected	Fixed in	Source
Chrome	157.0.8103.38 to before 157.0.8103.38	157.0.8103.38	CVE record (CNA) checked 3 Nov

Sources: KEV – CVE record ✓ Vendor ✓

Sources

feeds.feedburner.com: Stable Channel Update for Desktop

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