8.3

CVE-2026-97629: f5 nginx open source Use of Uninitialized Resource

CVSS: 8.3v4.0HighAwaiting analysis
AliasesDEBIAN-CVE-2026-97629UBUNTU-CVE-2026-97629
Published 14-10-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-97629 is a high (CVSS 8.3) Use of Uninitialized Resource vulnerability in f5 nginx open source. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.18%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12143-1

Timeline

  1. 14-10-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

Description When NGINX Plus or NGINX Open Source is configured with ssl_session_cache shared:name:size without an explicit ssl_session_ticket_key file directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions in a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates. Impact This vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

15-10-202618-10-2026
EPSS score
0.18%

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

F52 products
  • nginx open source≥ 1.31.0, < 1.31.7 | ≥ 1.30.0, < 1.30.6 | ≥ 1.23.3 (No fix recorded)
  • nginx plus≥ 37.1.0, < 37.1.0.1 | ≥ 37.0.0, < 37.0.5.1 | ≥ R36 (No fix recorded) | ≥ R35 (No fix recorded) | ≥ R34 (No fix recorded) | ≥ R33 (No fix recorded)
Debian1 product
  • nginxAll versions (No fix recorded) | < 1.30.4-8
Ubuntu1 product
  • nginxAll versions (No fix recorded)

3 vendors · 4 products

References

4 links