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NVD / CVE Program· CNA GitHub_M

CVE-2026-43894: jq: Wild stack write via signed-integer overflow in decNumber D2U() macro

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 jq 1.7.1-8 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to azl3 jq 1.7.1-8 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).

Published
May 11, 2026
Updated
Oct 26, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · GitHub_M
6.2
0.7 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43894

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
jqlangjq

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

    • <= 1.8.1affected

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

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.22jqbefore 1.8.2-r01.8.2-r0
Debian:12jqbefore 1.6-2.1+deb12u21.6-2.1+deb12u2
Debian:13jqbefore 1.7.1-6+deb13u31.7.1-6+deb13u3
Debian:14jqbefore 1.8.1-61.8.1-6
openSUSE:Leap 16.0jqbefore 1.7.1-160000.3.11.7.1-160000.3.1
openSUSE:Tumbleweedjqbefore 1.8.1-3.11.8.1-3.1
Red Hat:hummingbird:1jqbefore 0:1.8.2-0.1.hum10:1.8.2-0.1.hum1
Red Hat:hummingbird:1jq-develbefore 0:1.8.2-0.1.hum10:1.8.2-0.1.hum1
SUSE:Linux Enterprise Micro 5.3jqbefore 1.7.1-150000.3.25.11.7.1-150000.3.25.1
SUSE:Linux Micro 6.0jqbefore 1.7.1-1.11.7.1-1.1
SUSE:Linux Micro 6.1jqbefore 1.7.1-slfo.1.1_3.11.7.1-slfo.1.1_3.1
SUSE:Linux Micro 6.2jqbefore 1.7.1-160000.3.11.7.1-160000.3.1

Same product

jqlang: all records

Other 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…
    32Monitor
  • CVE-2026-40164jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed
    30Monitor
  • CVE-2026-32316jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-41256May 11, 2026 · jq: Embedded NUL truncates top-level jq programs loaded with -f
    22Monitor
  • ← EarlierCVE-2026-41257May 11, 2026 · jq: Signed-int overflow in `stack_reallocate` (jq VM stack)
    25Monitor
  • Later →CVE-2026-43895May 11, 2026 · jq: Embedded NUL in jq import paths causes local redaction-policy bypass and preserves sensitive fields in published artifacts
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 jq 1.7.1-8 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
alpine:jq1.8.2-r0 · Alpine:v3.22Package registry (OSV)
debian:jq1.6-2.1+deb12u2 · Debian:12Package registry (OSV)
opensuse:jq1.8.1-3.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:jq0:1.8.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:jq-devel0:1.8.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:jq1.7.1-160000.3.1 · SUSE:Linux Micro 6.2Package 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.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5467945 days apartjq: potential integer overflow in jvp_string_append
    27Monitor
  • CVE-2024-23337355 days apartjq has signed integer overflow in jv.c:jvp_array_write
    26Monitor
  • CVE-2026-412570 days apartjq: Signed-int overflow in `stack_reallocate` (jq VM stack)
    25Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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.

ATT&CK techniques

—

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