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CVE-2026-21428VulnerabilityPublished Updated

SUSE · Security update for cpp-httplib

Affects SUSESource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-21428· High 7.7

Public exploit available · CVSS 7.7 High : upgrade SUSE cpp-httplib to 0.30.0 as a priority.

Data as of 1 Nov 2026, 08:20 UTC

CVSS 4.0 base score
7.7High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.30.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    CVSS exploit maturity: proof of concept public

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Upgrade yhirose/cpp-httplib to 0.30.0.

Affected software

ProductAffectedFixed in
GitHubyhirose/cpp-httplibpkg:github/yhirose/cpp-httplibOther threatsAffected
  • <0.30.0
Fixed in
  • 0.30.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update has been released by the SUSE Product Security Team that fixes these vulnerabilities. Users of cpp-httplib should apply this update to remediate the issues. Patch status is not explicitly confirmed in the provided data; therefore, users should verify the availability and applicability of the update from the official SUSE advisories.

Description

Multiple security vulnerabilities have been identified and fixed in cpp-httplib, including server-side request forgery via header injection, denial of service through unsafe handling of compressed HTTP requests and crafted POST requests, information leakage through exception handling, and payload size limit bypass via gzip decompression. These issues could allow attackers to cause denial of service or leak sensitive information. The update addresses these vulnerabilities to improve the security of cpp-httplib.

References

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