jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow
jq is a command-line JSON processor. An integer overflow vulnerability exists through version 1.8.1 within the jvp_string_append() and jvp_string_copy_replace_bad functions, where concatenating strings with a combined length exceeding 2^31 bytes causes a 32-bit unsigned integer overflow in the buffer allocation size calculation, resulting in a drastically undersized heap buffer. Subsequent memory copy operations then write the full string data into this undersized buffer, causing a heap buffer overflow classified as CWE-190 (Integer Overflow) leading to CWE-122 (Heap-based Buffer Overflow). Any system evaluating untrusted jq queries is affected, as an attacker can crash the process or potentially achieve further exploitation through heap corruption by crafting queries that produce extremely large strings. The root cause is the absence of string size bounds checking, unlike arrays and objects which already have size limits. The issue has been addressed in commit e47e56d226519635768e6aab2f38f0ab037c09e5.
- Published
- Apr 13, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.5% · 39th percentile
- CWE
- CWE-122
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Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · GitHub_M
- 8.2
- 0.7 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| jqlang | jq | cpe:2.3:a:jqlang:jq |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- jqlang jqup to 1.8.1 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
jqlang jq
- < e47e56d226519635768e6aab2f38f0ab037c09e5affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.22 | jq | before 1.8.2-r0 | 1.8.2-r0 |
| Debian:12 | jq | before 1.6-2.1+deb12u2 | 1.6-2.1+deb12u2 |
| Debian:13 | jq | before 1.7.1-6+deb13u3 | 1.7.1-6+deb13u3 |
| Debian:14 | jq | before 1.8.1-5 | 1.8.1-5 |
| openSUSE:Leap 16.0 | jq | before 1.7.1-160000.3.1 | 1.7.1-160000.3.1 |
| openSUSE:Tumbleweed | jq | before 1.8.1-3.1 | 1.8.1-3.1 |
| Red Hat:hummingbird:1 | jq | before 0:1.8.1-3.hum1 | 0:1.8.1-3.hum1 |
| SUSE:Linux Enterprise Micro 5.3 | jq | before 1.6-150000.3.20.1 | 1.6-150000.3.20.1 |
| SUSE:Linux Micro 6.0 | jq | before 1.7.1-1.1 | 1.7.1-1.1 |
| SUSE:Linux Micro 6.0 | jq | before 1.6-6.1 | 1.6-6.1 |
| SUSE:Linux Micro 6.1 | jq | before 1.7.1-slfo.1.1_3.1 | 1.7.1-slfo.1.1_3.1 |
| SUSE:Linux Micro 6.2 | jq | before 1.7.1-160000.3.1 | 1.7.1-160000.3.1 |
Same product
jqlang: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-53427decNumberCopy in decNumber.c in jq through 1.7.1 does not properly consider that NaN is interpreted as numeric, which has a resultant stack-32Monitor
- CVE-2026-40164jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed30Monitor
- CVE-2025-48060AddressSanitizer: stack-buffer-overflow in jq_fuzz_execute (jv_string_vfmt)30Monitor
- CVE-2023-49355decToString in decNumber/decNumber.c in jq 88f01a7 has a one-byte out-of-bounds write via the " []-1.2e-1111111111" input.30Monitor
- CVE-2026-49839jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow28Monitor
- CVE-2026-54679jq: potential integer overflow in jvp_string_append27Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:jq | 1.8.2-r0 · Alpine:v3.22 | Package registry (OSV) |
| debian:jq | 1.6-2.1+deb12u2 · Debian:12 | Package registry (OSV) |
| opensuse:jq | 1.8.1-3.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:jq | 0:1.8.1-3.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| suse:jq | 1.7.1-160000.3.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-122 · Heap-based Buffer OverflowCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.