CVE-2026-69152: brace-expansion DoS — Exploit & Fix

Description

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.18, 2.1.4, 3.0.6, and 5.0.9, expand() does not apply maxLength while constructing comma-alternative intermediate arrays or padded sequences, allowing attacker-controlled input to exhaust memory or block the event loop. The fix for CVE-2026-14257 is bypassed by the vulnerability. This issue is fixed in versions 1.1.18, 2.1.4, 3.0.6, and 5.0.9.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0037

Probability of exploitation

0.29%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
juliangruber	brace-expansion	< 1.1.18
juliangruber	brace-expansion	2.0.0 — 2.1.4
juliangruber	brace-expansion	3.0.0 — 3.0.6
juliangruber	brace-expansion	4.0.0 — 5.0.9

References

Advisories & Patches

https://github.com/juliangruber/brace-expansion/commit/139d015104e71433ad52a41d19467c48ecbb2c7d https://github.com/juliangruber/brace-expansion/commit/1e30c930238d7162802d88a94189182def178dac https://github.com/juliangruber/brace-expansion/commit/688a99eeaab02627c2b89ba8ba4821fecfa659cf https://github.com/juliangruber/brace-expansion/commit/cb4b9e47cc2ec777c14b2b4492fb431a56f6a031 https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-rgw5-rvv9-x895 https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-rgw5-rvv9-x895

Exploits

https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-rgw5-rvv9-x895 https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-rgw5-rvv9-x895

Frequently Asked Questions

What is CVE-2026-69152? +

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.18, 2.1.4, 3.0.6, and 5.0.9, expand() does not apply maxLength while constructing comma-alternative intermediate arrays or padded sequences, allowing attacker-controlled input to exhaust memory or block the event loop. The fix for CVE-2026-14257 is bypassed by the vulnerability. This issue is fixed in versions 1.1.18, 2.1.4, 3.0.6, and 5.0.9. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-69152? +

CVE-2026-69152 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0037, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-69152? +

CVE-2026-69152 affects products from juliangruber, specifically: brace-expansion. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-69152? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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