5.5

CVE-2026-90996: fedoraproject sssd Integer Underflow (Wrap or Wraparound)

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-90996DEBIAN-CVE-2026-90996
Published 14-09-2026Last modified 07-10-2026
Open JSON

Vulnerability summary

CVE-2026-90996 is a medium (CVSS 5.5) Integer Underflow (Wrap or Wraparound) vulnerability in fedoraproject sssd. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 14-09-2026
    PublishedVulnerability first disclosed.
  2. 07-10-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the availability of the system responder.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

+0.02 pp

From 0.11% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugzilla.redhat.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Redhat2 products
Debian1 product
  • sssdAll versions (No fix recorded)
Fedoraproject1 product
Ubuntu1 product
  • sssdAll versions (No fix recorded)

4 vendors · 5 products

References

5 links