Quick answers
- Is CVE-2026-53922 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-53922 being exploited in the wild.
- How severe is CVE-2026-53922?
- Medium severity, with a CVSS score of 6.5, published 12 October 2026.
- Which products and versions are affected?
- OpenWrt Odhcpd up to commit cfddd56.
- Is there a fix for CVE-2026-53922?
- Yes: fixed in Commits c6792ba and d08dbcc and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-53922 attacked?
- It is attacked from the adjacent network, in a hosted service.
- Am I affected by CVE-2026-53922?
- Check whether you run OpenWrt Odhcpd at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Commits c6792ba and d08dbcc and later
Technical details
The vulnerability is an integer underflow in the dhcpv6_ia_handle_IAs() function triggered by crafting a RENEW packet with multiple IA_NA options. An unmatched IA causes a NOBINDING response larger than the remaining buffer space; subsequent subtraction from an unsigned size_t variable underflows, disabling length checks and permitting stack buffer overflow beyond the 512-byte pdbuf. Attack vector is network-adjacent with no authentication required; the stack canary protects against code execution but allows denial of service via repeated crashes.
Affected products
- OpenWrt odhcpd up to commit cfddd56
Timeline
- 2026-10-12: disclosed