Security readout for executives and security teams
Plain-English summary
CVE-2026-22776 can let an unauthenticated remote requester exhaust memory in applications using vulnerable cpp-httplib versions. The issue involves compressed request bodies that expand much larger after decompression. Business impact is service disruption, not data theft or code execution based on available sources.
Executive priority
Treat as a high-priority availability risk for internet-facing C++ services using cpp-httplib. Patch promptly where the library is embedded, especially in customer-facing APIs or services with strict uptime requirements.
Technical view
cpp-httplib before 0.30.1 checks payload_max_length against compressed network input but does not cap decompressed data stored in memory. This creates a CWE-409 zip bomb denial-of-service condition over HTTP/HTTPS. CVSS v4.0 is 8.7, with high availability impact and no privileges or user interaction required.
Likely exposure
Exposure is likely where products or internal services embed yhirose cpp-httplib before 0.30.1 and accept compressed HTTP request bodies such as gzip or br. Header-only use may make detection harder because the library can be vendored directly into source trees.
Exploitation context
Sources do not indicate active exploitation, and the CVE is not marked in KEV. Exploitation requires network access to an affected service that processes compressed request bodies. The practical result is availability loss through memory exhaustion.
Researcher notes
The key validation point is whether payload limits apply after decompression, not only to compressed input size. Review the GitHub advisory and patch commit for implementation details. No source in the bundle claims confidentiality, integrity, code execution, or active exploitation.
Mitigation direction
- Upgrade cpp-httplib to version 0.30.1 or later.
- Search source and vendored dependencies for embedded cpp-httplib copies.
- Prioritize internet-facing services that accept HTTP request bodies.
- If upgrade is delayed, follow the GitHub advisory for vendor-supported guidance.
Validation and detection
- Confirm deployed cpp-httplib version is 0.30.1 or later.
- Check build artifacts and repositories for vendored httplib headers.
- Identify endpoints that accept compressed HTTP request bodies.
- Review service monitoring for memory exhaustion or abnormal request-driven crashes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-409: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-22776 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h934-98h4-j43qCVE reference · x_refsource_CONFIRM
- https://github.com/yhirose/cpp-httplib/commit/2e2e47bab1ae6a853476eecbc4bf279dd1fef792CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Handling of Highly Compressed Data (Data Amplification)
Improper Handling of Highly Compressed Data (Data Amplification) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.