Application crash or secure-cookie replacement via path over-read
Published Sep 12, 2025 · Updated Jun 2, 2026
Out-of-bounds read in libcurl 8.13.0 through 8.15.0 allows remote attackers to crash applications or replace secure cookies. Cookie path comparison treats a one-byte "/" path as if it had a trailing slash, reads beyond its heap allocation, and can wrongly accept an insecure cookie replacement. Exploitation requires control of an HTTP site matching the HTTPS host or a man-in-the-middle position; the curl command-line tool itself is not affected.
Summary
What happened
Out-of-bounds read in libcurl 8.13.0 through 8.15.0 allows remote attackers to crash applications or replace secure cookies. Cookie path comparison treats a one-byte "/" path as if it had a trailing slash, reads beyond its heap allocation, and can wrongly accept an insecure cookie replacement. Exploitation requires control of an HTTP site matching the HTTPS host or a man-in-the-middle position; the curl command-line tool itself is not affected.
The record
- CVE
- CVE-2025-9086
- Published
- Sep 12, 2025
- Updated
- Jun 2, 2026
- Vendor
- Siemens
- Product
- SCALANCE XRM334 (24 V DC, 12xFO)
- Classifications
- CWE-125, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 12, 2025CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <V3.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- HackerOne report 3294999 reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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