What’s Vulnerable › Vulnerabilities

CVE-2026-103471: restbed through 5.0.0 Denial of Service via Unbounded Header Buffering

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-09-30
• Weakness: CWE-770

Description

restbed through 5.0.0 buffers HTTP request headers without enforcing a maximum size limit, allowing remote unauthenticated attackers to exhaust server memory. Attackers can open TCP connections and stream bytes indefinitely without sending the header delimiter, forcing the server to allocate unbounded heap memory until the process is killed.

Affected products

• Corvusoft restbed: through 5.0.0

References

• https://github.com/Corvusoft/restbed
• https://github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/detail/service_impl.cpp#L554
• https://github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/session.cpp#L200
• https://github.com/Corvusoft/restbed/issues/558
• https://www.vulncheck.com/advisories/restbed-through-5.0.0-denial-of-service-via-unbounded-header-buffering
• https://github.com/Corvusoft/restbed/issues/558

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