5.4

CVE-2026-48758: sigstore sigstore-js

CVSS: 5.4v3.1MediumDeferred
AliasesCGA-5v58-763c-mv26CGA-9p82-2qmm-j259GHSA-jfc7-64v2-mr8c
Published 14-07-2026Last modified 15-07-2026
Open JSON

Vulnerability summary

CVE-2026-48758 is a medium (CVSS 5.4) vulnerability in sigstore sigstore-js. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-9W9G-H55C-C35V

Timeline

  1. 14-07-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • graalvm-25-ce-nodejs< 25.0.3-r9
  • pulumi-language-nodejs< 3.248.0-r1
@sigstore1 product
  • core< 3.2.1
Sigstore1 product
Wolfi1 product
  • pulumi-language-nodejs< 3.248.0-r1

4 vendors · 5 products

References

7 links