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CVE-2026-40930

LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f3b5c834867eb4fa8d6b90917f237684bbd7c9e605fd6f16ea103cb01de6af24
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"libpng-apng","vendor":"pnggroup","versions":[{"status":"affected","version":">= 1.6.49, <= 1.6.57"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/affected/1

{"product":"libpng","vendor":"pnggroup","versions":[{"status":"affected","version":"= 1.8.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"libpng-apng","vendor":"pnggroup","versions":[{"status":"affected","version":">= 1.6.49, <= 1.6.57"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/affected/1
{"product":"libpng","vendor":"pnggroup","versions":[{"status":"affected","version":"= 1.8.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/05/15/21"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/adp/0/references/0
{"name":"https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4","tags":["x_refsource_MISC"],"url":"https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /containers/cna/references/1
{"name":"https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:16f025b3f95790d15bb8a46abd3b034092c36ff6be4ba556d31a07959c07f173 · sha256:9feeb2bf1cef225f… · /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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