GHSA-gg6h-894w-4m9c: re2js (CVE-2026-116795)

Package	Ecosystem	Affected	Fixed in
re2js	npm	>=2.2.0, <2.8.7	2.8.7

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The re2js npm package, versions 2.2.0 up to but not including 2.8.7, has a quadratic-time matching problem when the opt-in LOOKBEHINDS flag is used with repeated-matching APIs such as find loops, matchAll, split, or replaceAll. An attacker who can supply text to be matched, such as user input or uploaded logs, can cause a single call on about 16,000 characters to take tens of seconds of CPU, which can stall a Node.js process. The fix is to upgrade to re2js 2.8.7.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0046, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

28 Oct 2026, 17:14 UTC Confirmed by the CVE List
28 Oct 2026, 18:17 UTC Confirmed by NVD
31 Oct 2026, 13:32 UTC First seen by agentprime
31 Oct 2026, 13:32 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.