---
title: "CVE-2025-9288: sha.js is missing type checks leading to hash rewind and passing on crafted data"
url: https://erroneo.us/security/cve/CVE-2025-9288/
description: "CVE-2025-9288 (sha.js (npm)): Improper Input Validation vulnerability in sha.js allows Input Data Manipulation.This issue affects sha.js: through 2.4.11."
type: vulnerability-record
section: "Security Digest"
date_published: 2025-08-20
date_modified: 2025-11-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-9288"
kev: false
cvss: 9.1
epss: 0.00738
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-9288: sha.js is missing type checks leading to hash rewind and passing on crafted data

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.7% , percentile 54: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 54% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes sha.js (npm) <= 2.4.11, fixed in 2.4.12 . Check your lockfile, including transitive dependencies.

## What it is

Improper Input Validation vulnerability in sha.js allows Input Data Manipulation.This issue affects sha.js: through 2.4.11.

## Affected packages

- npm `sha.js` <= 2.4.11 → fixed: 2.4.12

## Affected products (CVE record)

-  sha.js: <= 2.4.11

## Severity

- harborist CVSS 4.0: 9.1 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:N`
- GitHub CVSS 4.0: 9.1 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.74% probability of exploitation activity in the next 30 days; percentile 54.

## Sources

- [github.com](https://github.com/browserify/sha.js/security/advisories/GHSA-95m3-7q98-8xr5)
- [github.com](https://github.com/browserify/sha.js/pull/78)
- [GitHub Advisory GHSA-95m3-7q98-8xr5](https://github.com/advisories/GHSA-95m3-7q98-8xr5)
- [CVE.org record CVE-2025-9288](https://www.cve.org/CVERecord?id=CVE-2025-9288)
- [NVD entry CVE-2025-9288](https://nvd.nist.gov/vuln/detail/CVE-2025-9288)
- [cve.org](https://www.cve.org/CVERecord?id=CVE-2025-9287)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2025/09/msg00016.html)
- [github.com](https://github.com/browserify/sha.js/commit/f2a258e9f2d0fcd113bfbaa49706e1ac0d979ba5)

---
Source page: https://erroneo.us/security/cve/CVE-2025-9288/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt