CVE Explorer

CVE-2026-29078

Lexbor is a web browser engine library. Prior to 2.7.0, the ISO‑2022‑JP encoder in Lexbor fails to reset the temporary size variable between iterations. The statement ctx->buffer_used -= size with a stale size = 3 causes an integer underflow that wraps to SIZE_MAX. Afterwards, memcpy is called with a negative length, leading to an out‑of‑bounds read from the stack and an out‑of‑bounds write to the heap. The source data is partially controllable via the contents of the DOM tree. This vulnerabilit

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:975772b54c36ac8c279a344903f79bba09a91774a213e9944fdb5887ad9ee01c

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion

{"product":"lexbor","vendor":"lexbor","versions":[{"status":"affected","version":"< 2.7.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions

{"cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/lexbor/lexbor/security/advisories/GHSA-mrwr-xh7f-96v3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lexbor/lexbor/security/advisories/GHSA-mrwr-xh7f-96v3"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:f85ac5a5cc3a0c787166fb3caa9fbd7889f352e87105f058e114e7e7a4846380 · sha256:521d1487173c59c1… · /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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