CVE-2026-102277

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). 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
Trending — Patch released this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.21, 2.1.7, 3.0.9, and 5.0.12, the expand function handles untrusted {a},b}-shaped patterns with many trailing closing braces by restarting its scan once for each trailing closing brace. The successive full-input rescans with linear working-string growth cause quadratic CPU time and memory pressure that can block the Node.js event loop. The process eventually recovers, making the impact a recoverable CPU denial of service. This issue is fixed in versions 1.1.21, 2.1.7, 3.0.9, and 5.0.12.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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 28, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 28, 2026
Patch available. Sources: github, github_commit.
github_commit

commit ffdfa3e3806b (juliangruber/brace-expansion)

Fix landed in juliangruber/brace-expansion commit ffdfa3e3806b — awaiting tagged release

https://github.com/juliangruber/brace-expansion/commit/ffdfa3e3806bed17c0874b8f1439b084de354a7e
github_commit

commit c55e67d8d8b1 (juliangruber/brace-expansion)

Fix landed in juliangruber/brace-expansion commit c55e67d8d8b1 — awaiting tagged release

https://github.com/juliangruber/brace-expansion/commit/c55e67d8d8b1c56a2474afff15c2891166b2d364
github_commit

commit bdff773f98e5 (juliangruber/brace-expansion)

Fix landed in juliangruber/brace-expansion commit bdff773f98e5 — awaiting tagged release

https://github.com/juliangruber/brace-expansion/commit/bdff773f98e5988616b7039cc9b508df5d640b22
github_commit

commit 33a5ef17b8d8 (juliangruber/brace-expansion)

Fix landed in juliangruber/brace-expansion commit 33a5ef17b8d8 — awaiting tagged release

https://github.com/juliangruber/brace-expansion/commit/33a5ef17b8d800bbfa8c52b14c39043b6aac1a96
github Patch Available

Quadratic-time expansion of the `{a},b}` rewrite causes CPU denial of service · Advisory · juliangruber/brace-expansion · GitHub

https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-q2hr-2g5m-vwhr

Vendor Advisories for CVE-2026-102277(2)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnodejs22-main-10.9.9-1.22.23.3.2.3.2.2.hum12026-09-30redhat
redhatnodejs24-main-11.19.0-1.24.21.0.1.2.hum12026-09-30redhat
redhatnodejs26-main-11.19.1-1.26.10.0.0.3.hum12026-09-30redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
brace-expansion—5.0.12—

Weakness Classification(2)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 16× in last 7d / 16× 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. 2026-10-04 02:10 UTCEG score recompute
  2. 2026-10-04 02:10 UTCVendor advisory
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-03 00:08 UTCEG score recompute
  5. 2026-10-03 00:08 UTCVendor advisory
  6. 2026-10-01 22:06 UTCEG score recompute
  7. 2026-10-01 22:06 UTCVendor advisory
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-09-30 20:02 UTCEG score recompute
  10. 2026-09-30 15:02 UTCEPSS rescore
  11. 2026-09-29 20:31 UTCEG score recompute
  12. 2026-09-29 19:44 UTCEG score recompute
  13. 2026-09-29 15:20 UTCEPSS rescore
  14. 2026-09-28 21:18 UTCEG score recompute
  15. 2026-09-28 21:03 UTCEG score recompute
  16. 2026-09-28 21:02 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:74161

Frequently asked(5)

What is CVE-2026-102277?
CVE-2026-102277 is a medium vulnerability published on September 28, 2026. The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.21, 2.1.7, 3.0.9, and 5.0.12, the expand function handles untrusted {a},b}-shaped patterns with many trailing closing braces by restarting its scan once for each trailing closing brace. The…
When was CVE-2026-102277 disclosed?
CVE-2026-102277 was first published on September 28, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102277 actively exploited?
CVE-2026-102277 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-2026-102277?
CVE-2026-102277 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102277?
A fix for CVE-2026-102277 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102277 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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