CVE-2026-1521

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

A security flaw has been discovered in Open5GS up to 2.7.6. This affects the function sgwc_s5c_handle_bearer_resource_failure_indication of the file src/sgwc/s5c-handler.c of the component SGWC. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 69b53add90a9479d7960b822fc60601d659c328b. It is recommended to apply a patch to fix this issue.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

January 28, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 6, 2026
Patch available. Sources: github_commit.
generic

[Bug]: SGW-C crash: `sgwc_s5c_handle_bearer_resource_failure_indication` asserts on missing/stale `s11_xact` when BearerResourceFailureIndication arrives after S11 transaction timeout (`s5c-handler.c:992`) · Issue #4268 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4268#issue-3795012861
generic

[Bug]: SGW-C crash: `sgwc_s5c_handle_bearer_resource_failure_indication` asserts on missing/stale `s11_xact` when BearerResourceFailureIndication arrives after S11 transaction timeout (`s5c-handler.c:992`) · Issue #4268 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4268#event-21989483261
generic

[Bug]: SGW-C crash: `sgwc_s5c_handle_bearer_resource_failure_indication` asserts on missing/stale `s11_xact` when BearerResourceFailureIndication arrives after S11 transaction timeout (`s5c-handler.c:992`) · Issue #4268 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4268
github_commit Patch Available

commit 69b53add90a9 (open5gs/open5gs)

Patch available: open5gs/open5gs v2.7.7 (contains commit 69b53add90a9)

https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b
generic

GitHub - open5gs/open5gs: Open5GS is a C-language Open Source implementation for 5G Core and EPC, i.e. the core network of LTE/NR network (Release-19) · GitHub

https://github.com/open5gs/open5gs/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 26× 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.

Showing the most recent 100 of 156 total refreshes for this CVE.

  1. 2026-09-19 21:00 UTCOSV refresh
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
  4. 2026-09-16 05:14 UTCEPSS rescore
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  17. 2026-09-01 00:04 UTCOSV refresh
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  1. 2026-08-20 22:55 UTCEPSS rescore
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  8. 2026-08-15 00:52 UTCGHSA enrichment
  9. 2026-08-14 12:04 UTCEG score recompute
  10. 2026-08-14 12:04 UTCGHSA enrichment
  11. 2026-08-13 22:00 UTCEPSS rescore
  12. 2026-08-13 04:09 UTCEG score recompute
  13. 2026-08-13 04:09 UTCGHSA enrichment
  14. 2026-08-12 13:50 UTCEPSS rescore
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  17. 2026-08-10 10:21 UTCGHSA enrichment
  18. 2026-08-09 16:57 UTCEG score recompute
  19. 2026-08-09 16:57 UTCGHSA enrichment
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-07 23:18 UTCEG score recompute
  23. 2026-08-07 23:18 UTCGHSA enrichment
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-06 04:48 UTCEG score recompute
  26. 2026-08-06 04:48 UTCGHSA enrichment
  27. 2026-08-05 19:17 UTCEPSS rescore
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  31. 2026-08-02 21:57 UTCEG score recompute▲ 2.20
  32. 2026-08-02 21:57 UTCGHSA enrichment
  33. 2026-08-02 02:26 UTCEPSS rescore
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  35. 2026-07-31 05:42 UTCOSV refresh
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  45. 2026-07-23 03:05 UTCEG score recompute
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  61. 2026-07-13 13:08 UTCOSV refresh
  62. 2026-07-13 06:12 UTCEPSS rescore
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  65. 2026-07-09 19:10 UTCEPSS rescore
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  74. 2026-07-01 15:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-1521?
CVE-2026-1521 is a high vulnerability published on January 28, 2026. A security flaw has been discovered in Open5GS up to 2.7.6. This affects the function sgwcs5chandlebearerresourcefailureindication of the file src/sgwc/s5c-handler.c of the component SGWC. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has…
When was CVE-2026-1521 disclosed?
CVE-2026-1521 was first published in the National Vulnerability Database on January 28, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-1521 actively exploited?
CVE-2026-1521 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.5% of all scored CVEs.
What is the CVSS score of CVE-2026-1521?
CVE-2026-1521 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-1521?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-1521, 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.

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