8.8

CVE-2026-41957: f5 big-ip Deserialization of Untrusted Data

CVSS: 8.8v3.1HighAnalyzed
Published 13-05-2026Last modified 14-05-2026
Open JSON

Vulnerability summary

CVE-2026-41957 is a high (CVSS 8.8) Deserialization of Untrusted Data vulnerability in f5 big-ip. EPSS estimates a 0.87% chance of exploitation in the next 30 days, higher than 58.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.87%
0%100%
Low · +0.36 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-05-2026
    PublishedVulnerability first disclosed.
  2. 14-05-2026
    Last modifiedVulnerability information updated.

Description

An authenticated remote code execution vulnerability through undisclosed vectors exists in the BIG-IP and BIG-IQ Configuration utility.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.87%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

+0.36 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.87%

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

F524 products

1 vendor · 24 products

References

1 links