libgphoto2 has OOB read in ptp_unpack_Sony_DPD() FormFlag parsing in ptp-pack.c

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Summary

CVECVE-2026-40339
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-18 00:16:37 UTC
Updated2026-04-18 00:16:37 UTC
Descriptionlibgphoto2 is a camera access and control library. Versions up to and including 2.5.33 have an out-of-bounds read in `ptp_unpack_Sony_DPD()` in `camlibs/ptp2/ptp-pack.c` (line 842). The function reads the FormFlag byte via `dtoh8o(data, *poffset)` without a prior bounds check. The standard `ptp_unpack_DPD()` at lines 686–687 correctly validates `*offset + sizeof(uint8_t) > dpdlen` before this same read, but the Sony variant omits this check entirely. Commit 09f8a940b1e418b5693f5c11e3016a1ad2cea62d fixes the issue.

Risk And Classification

Primary CVSS: v3.1 5.2 MEDIUM from [email protected]

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.2MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
3.1CNADECLARED5.2MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
Low

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gphoto Libgphoto2 affected <= 2.5.33 Not specified

References

ReferenceSourceLinkTags
github.com/gphoto/libgphoto2/commit/09f8a940b1e418b5693f5c11e3016a1ad2ce... [email protected] github.com
github.com/gphoto/libgphoto2/security/advisories/GHSA-42cm-m9hc-r7q8 [email protected] github.com
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