What’s Vulnerable › Vulnerabilities

CVE-2019-11940

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-04 · updated 2026-06-17
• Weakness: CWE-416

Description

In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.

Affected products

• Facebook proxygen: from 0.29.0 through 2017.04.03.00

References

• https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f
• https://www.facebook.com/security/advisories/cve-2019-11940
• https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f
• https://www.facebook.com/security/advisories/cve-2019-11940

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