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CVE-2026-28231

pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default s
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0069514001a7ce8709228b2b1168d96c49d43f2a9baba921c435b83a42c79650
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"pillow_heif","vendor":"bigcat88","versions":[{"status":"affected","version":"< 1.3.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.5,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27a2c59c7a","tags":["x_refsource_MISC"],"url":"https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27a2c59c7a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/references/1
{"name":"https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0","tags":["x_refsource_MISC"],"url":"https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /containers/cna/references/2
{"name":"https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fe86ee660c39dfb723b1e9301b8f635262cd60705f3568a10e5f27b5200859ed · sha256:471bc5031d545c56… · /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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