cJSON 1.7.19 Wrong-Key Modification via JSON Pointer Escape Decoding (CVE-2026-29036) | HOL Guard CVE

High · CVSS 7.5CVE-2026-29036

cJSON 1.7.19 Wrong-Key Modification via JSON Pointer Escape Decoding

Answer in brief

CVE-2026-29036 records a High severity (CVSS 7.5) vulnerability in cJSON 1.7.19 Wrong-Key Modification via JSON Pointer Escape Decoding. The current sources do not mark it as known exploited. The current feed maps DaveGamble/cJSON (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 11, 2026Updated Aug 14, 2026Source checked Sep 26, 2026First seen by HOL Aug 11, 2026Material review Aug 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps DaveGamble/cJSON (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
DaveGamble/cJSONgeneric	1.5.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for DaveGamble/cJSON.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source description

cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.

Quoted source text, attributed separately from HOL analysis.