CVE-2026-55436: V2 · Coder's AI Bridge Proxy skips TLS certificate verification in default configuration
Affects github.com/coder/coder/v2Source GCVE Database
Not known to be exploited · CVSS 7.4 High : upgrade to 2.34.2 soon.
Data as of 29 Oct 2026, 19:04 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 17% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.34.2, 2.33.8, 2.32.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 6 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade github.com/coder/coder/v2 to 2.34.2; github.com/coder/coder/v2 to 2.33.8; github.com/coder/coder/v2 to 2.32.7.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Gogithub.com/coder/coder/v2 | Affected
| Fixed in
|
| Gogithub.com/coder/coder/v2 | Affected
| Fixed in
|
| Gogithub.com/coder/coder/v2 | Affected
| Fixed in
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Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available and has been released in versions 2.32.7, 2.33.8, and 2.34.2 of Coder. Users should upgrade to these or later versions to ensure TLS certificate verification is enforced unconditionally. Until patched, users should secure the network path between the AI Bridge Proxy and the Coder server, for example by using loopback interfaces or mutual TLS (mTLS), and ensure the Coder access URL uses a trusted TLS certificate. The vendor advisory confirms the fix and recommends these workarounds.
Description
### Summary The AI Bridge Proxy (`aibridgeproxyd`) created a goproxy server whose default transport set `InsecureSkipVerify: true` and only assigned a secure transport when an upstream proxy was configured. In the default configuration (no upstream proxy), outbound HTTPS to the Coder access URL accepted any TLS certificate. > **Note:** Practical exploitation requires an on-path (man-in-the-middle) position between the AI Bridge Proxy and the Coder server. Deployments where they are co-located over loopback are effectively unaffected. ### Impact An attacker positioned between the proxy and the Coder server, via ARP spoofing, DNS poisoning or control of proxy environment variables, could intercept injected Coder session tokens, user-supplied provider API keys (BYOK) and full request and response bodies including prompts and completions. The default transport also honored `HTTP_PROXY` and `HTTPS_PROXY`, allowing environment-based traffic redirection. ### Patches The fix applies the secure transport (TLS 1.2 or higher using system root CAs) unconditionally. The AI Bridge Proxy was introduced in v2.30.0. Earlier release lines including the v2.29 ESR line are not affected. The fix is available in the following releases: | Release line | Patched version | |---|---| | 2.34 | [v2.34.2](https://github.com/coder/coder/releases/tag/v2.34.2) | | 2.33 | [v2.33.8](https://github.com/coder/coder/releases/tag/v2.33.8) | | 2.32 | [v2.32.7](https://github.com/coder/coder/releases/tag/v2.32.7) | ### Workarounds Ensure the Coder access URL uses a trusted certificate and secure the network path between the AI Bridge Proxy and the Coder server (for example, loopback or mTLS). ### Resources - Fix: #26131 ### Credits Coder would like to thank Anthropic's Security Team (ANT-2026-22455) for independently disclosing this issue!