# CVE-2026-119760: sniproxy through 0.7.0 NULL Pointer Dereference via resolv_cancel()

Status: published. Published: 2026-10-30. Updated: 2026-11-05.

sniproxy through 0.7.0 contains a NULL pointer dereference vulnerability in resolv_cancel() that allows remote unauthenticated attackers to crash the daemon by sending overlong hostnames. Attackers can send a 254 or 255 character TLS SNI name or HTTP Host header matching a wildcard backend, then close the connection to terminate the proxy.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/renaudallard/sniproxy/commit/d5d78290c8fe15d9aa12185d2c57739b7b0c6a6b
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/renaudallard/sniproxy/commit/17986ba7397297313331297cac3b9eb3f0ba96b7

## Affected products and versions

- dlundquist / sniproxy (dlundquist/sniproxy): ≥ 0; ≤ 0.7.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.48% as of 2026-11-04; percentile 41.31%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-476

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/dlundquist/sniproxy/issues/411 (CNA: VulnCheck; issue-tracking)

- https://github.com/dlundquist/sniproxy/blob/1cc625ea41796695a54593d1bd779366b82b8b4e/src/connection.c#L737-L738 (CNA: VulnCheck; technical-description)

- https://github.com/dlundquist/sniproxy/blob/1cc625ea41796695a54593d1bd779366b82b8b4e/src/resolv.c#L219-L224 (CNA: VulnCheck; technical-description)

- https://github.com/renaudallard/sniproxy/commit/d5d78290c8fe15d9aa12185d2c57739b7b0c6a6b (CNA: VulnCheck; patch)

- https://github.com/renaudallard/sniproxy/commit/17986ba7397297313331297cac3b9eb3f0ba96b7 (CNA: VulnCheck; patch)

- https://github.com/dlundquist/sniproxy (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/sniproxy-through-0.7.0-null-pointer-dereference-via-resolv-cancel (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-119760; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119760; retrieved 2026-11-05; source updated Not reported

Revision: 8ea47a9b6b32652b8e899b2cf22c41ba810ddf8210e3bc3f15546d01833ce01d

Canonical: https://y2.dev/cve/CVE-2026-119760

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