CVE-2026-74222

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-30. A secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.2EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.2Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.

CVSS v3
8.2
EG Score
8.2HIGHhigh confidence
EG Risk
52
EG Risk 52/100CISA SSVC

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
Severity82% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 2, 2026

Advisory Details (4)

Auto-updated Sep 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback | Advisories | VulnCheck

https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback
generic

GitHub - u-boot/u-boot: "Das U-Boot" Source Tree · GitHub

https://github.com/u-boot/u-boot
generic

u-boot/net/lwip/wget.c at v2026.07 · u-boot/u-boot · GitHub

https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194
github_commit

commit 2d94618a58ae (u-boot/u-boot)

Fix landed in u-boot/u-boot commit 2d94618a58ae — awaiting tagged release

https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616

Vendor Advisories for CVE-2026-74222(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× 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.

  1. 2026-10-05 01:57 UTCEG score recompute
  2. 2026-10-05 01:57 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 13:50 UTCGHSA enrichment
  5. 2026-10-04 01:42 UTCEG score recompute
  6. 2026-10-04 01:42 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 13:35 UTCGHSA enrichment
  9. 2026-10-03 01:27 UTCEG score recompute
  10. 2026-10-03 01:27 UTCGHSA enrichment
  11. 2026-10-02 13:18 UTCEG score recompute
  12. 2026-10-02 13:18 UTCGHSA enrichment
  13. 2026-10-02 12:46 UTCEG score recompute
  14. 2026-10-02 12:46 UTCGHSA enrichment
  15. 2026-10-02 05:12 UTCEG score recompute
  16. 2026-10-02 05:12 UTCGHSA enrichment
  17. 2026-10-01 19:50 UTCEPSS rescore
  18. 2026-10-01 17:02 UTCGHSA enrichment
  19. 2026-10-01 04:55 UTCGHSA enrichment
  20. 2026-09-30 16:45 UTCEG score recompute
  21. 2026-09-30 16:45 UTCGHSA enrichment
  22. 2026-09-30 10:37 UTCEG score recompute
  23. 2026-09-30 10:37 UTCGHSA enrichment
  24. 2026-09-29 22:25 UTCEG score recompute
  25. 2026-09-29 21:37 UTCEG score recompute
Show 1 more
  1. 2026-09-29 21:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74222?
CVE-2026-74222 is a high vulnerability published on September 29, 2026. U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpcrecvcb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERRBUF instead of ERRABRT, causing the TCP input path to access released memory and…
When was CVE-2026-74222 disclosed?
CVE-2026-74222 was first published on September 29, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74222 actively exploited?
CVE-2026-74222 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74222?
CVE-2026-74222 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74222?
An upstream fix for CVE-2026-74222 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-74222 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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