CVE-2026-55487

Description

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, the generic peer-suffix normalizer also stripped parenthesized text from git, URL, tarball, file, and other opaque locators. Approval for one source string could therefore authorize a different attacker-controlled source whose locator normalized to the same value. This vulnerability is fixed in 10.34.2 and 11.5.3.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0012

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-346 CWE-346

CWE-693 CWE-693

CWE-829 CWE-829

Affected Products

Vendor	Product	Versions
pnpm	pnpm	< 10.34.2
pnpm	pnpm	11.0.0 — 11.5.3

References

Advisories & Patches

https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57r https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57r

Exploits

https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57r https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57r

Frequently Asked Questions

What is CVE-2026-55487? +

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, the generic peer-suffix normalizer also stripped parenthesized text from git, URL, tarball, file, and other opaque locators. Approval for one source string could therefore authorize a different attacker-controlled source whose locator normalized to the same value. This vulnerability is fixed in 10.34.2 and 11.5.3. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-55487? +

CVE-2026-55487 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0012, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-55487? +

CVE-2026-55487 affects products from pnpm, specifically: pnpm. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-55487? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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