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CVE-2026-26309

Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, an off-by-one write in Envoy::JsonEscaper::escapeString() can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the resulting string is later treated as a C-string. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2b0aa288743515b60a494058a76a2fddcc85864148fc9645dd4df439943471e5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"envoy","vendor":"envoyproxy","versions":[{"status":"affected","version":">= 1.37.0, < 1.37.1"},{"status":"affected","version":">= 1.36.0, < 1.36.5"},{"status":"affected","version":">= 1.35.0, < 1.35.9"},{"status":"affected","version":"< 1.34.13"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:629bed7f55dc5b27b72031713a40c2518ad72bd15c010c85d81233d8dc8168ec · sha256:89fed0c2da6159f2… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:629bed7f55dc5b27b72031713a40c2518ad72bd15c010c85d81233d8dc8168ec · sha256:89fed0c2da6159f2… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-193","description":"CWE-193: Off-by-one Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:629bed7f55dc5b27b72031713a40c2518ad72bd15c010c85d81233d8dc8168ec · sha256:89fed0c2da6159f2… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-56cj-wgg3-x943","tags":["x_refsource_CONFIRM"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-56cj-wgg3-x943"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:629bed7f55dc5b27b72031713a40c2518ad72bd15c010c85d81233d8dc8168ec · sha256:89fed0c2da6159f2… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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