CVE-2026-50161

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr->len can wrap when hdr->len is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 19, 2026

Advisory Details (4)

Auto-updated Aug 23, 2026
Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available

Integer overflow in websock_decode() masked frame length check leads to heap buffer overflow · Advisory · baresip/re · GitHub

https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h
github_release Patch Available

v4.8.1

Patch available: baresip/re v4.8.1

https://github.com/baresip/re/releases/tag/v4.8.1
github_pr Patch Available

websock: Fix integer overflow in websock_decode() masked frame check

Patch available: baresip/re v4.8.1 (PR #1584 merged 2026-05-28)

https://github.com/baresip/re/pull/1584
github_commit Patch Available

commit 718b92615c79 (baresip/re)

Patch available: baresip/re v4.8.1 (contains commit 718b92615c79)

https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 02:45 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-29 03:47 UTCEG score recompute
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 16:22 UTCEG score recompute
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-26 18:13 UTCEG score recompute
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 15:08 UTCEG score recompute
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-24 17:11 UTCEG score recompute
  12. 2026-08-24 09:51 UTCEG score recompute
  13. 2026-08-23 00:55 UTCEG score recompute
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-22 02:59 UTCEG score recompute
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-21 01:23 UTCEG score recompute
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-19 20:09 UTCEG score recompute
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-19 16:26 UTCEG score recompute
  22. 2026-08-19 15:22 UTCEG score recompute
  23. 2026-08-18 18:22 UTCEG score recompute
  24. 2026-08-18 18:06 UTCEG score recompute
  25. 2026-08-18 18:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-50161?
CVE-2026-50161 is a critical vulnerability published on August 18, 2026. libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websockdecode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The…
When was CVE-2026-50161 disclosed?
CVE-2026-50161 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50161 actively exploited?
CVE-2026-50161 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.7% of all scored CVEs.
What is the CVSS score of CVE-2026-50161?
CVE-2026-50161 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-50161?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50161, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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