CVE-2026-33948

MEDIUMNVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3% (27th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
5.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

jq is a command-line JSON processor. Commits before 6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b contain a vulnerability where CLI input parsing allows validation bypass via embedded NUL bytes. When reading JSON from files or stdin, jq uses strlen() to determine buffer length instead of the actual byte count from fgets(), causing it to truncate input at the first NUL byte and parse only the preceding prefix. This enables an attacker to craft input with a benign JSON prefix before a NUL byte followed by malicious trailing data, where jq validates only the prefix as valid JSON while silently discarding the suffix. Workflows relying on jq to validate untrusted JSON before forwarding it to downstream consumers are susceptible to parser differential attacks, as those consumers may process the full input including the malicious trailing bytes. This issue has been patched by commit 6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
27th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 14, 2026

Last Modified

October 9, 2026

Advisory Details (2)

Auto-updated Aug 3, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Embedded-NUL Truncation in jq CLI JSON Input Path Causes Prefix-Only Validation of Malformed Input · Advisory · jqlang/jq · GitHub

https://github.com/jqlang/jq/security/advisories/GHSA-32cx-cvvh-2wj9
GitHub commit

commit 6374ae0bcdfe (jqlang/jq)

Fix landed in jqlang/jq commit 6374ae0bcdfe — awaiting tagged release

https://github.com/jqlang/jq/commit/6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b

Vendor Advisories for CVE-2026-33948(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntujq (1.5+dfsg-1ubuntu0.1+esm4) @ xenial2026-06-14ubuntu
ubuntulibjq1 (1.8.1-4ubuntu2) @ resolute2026-06-14ubuntu
redhatjq-main-1.8.1-3.hum12026-04-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
jq—
  • every version up to 1.8.2-r0: fixed in 1.8.2-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
jq—
  • every version up to 1.8.2-r0: fixed in 1.8.2-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
jq—
  • every version up to 1.8.2-r0: fixed in 1.8.2-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
jq1.6-2.1, 1.6-2.1+deb11u1
  • every version up to 1.6-2.1+deb11u2: fixed in 1.6-2.1+deb11u2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
jq1.6-2.1, 1.6-2.1+deb12u1
  • every version up to 1.6-2.1+deb12u2: fixed in 1.6-2.1+deb12u2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
jq1.7.1-6+deb13u1
  • every version up to 1.7.1-6+deb13u2: fixed in 1.7.1-6+deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
jq1.8.0-1, 1.8.1-1, 1.8.1-2, 1.8.1-3, 1.8.1-4
  • every version up to 1.8.1-5: fixed in 1.8.1-5
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 32× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 216 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 118 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  2. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  3. 2026-10-18 03:46 UTCEG score recompute
  4. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  7. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  8. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  9. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-10-12 16:13 UTCEG score recompute
  11. 2026-10-11 19:55 UTCEG score recompute
  12. 2026-10-11 17:08 UTCEG score recompute
  13. 2026-10-11 14:35 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  17. 2026-10-09 10:51 UTCEG score recompute
  18. 2026-10-09 10:51 UTCVendor advisory
  19. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  20. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  21. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  22. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  24. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  25. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
Show 73 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-09-21 07:49 UTCOSV refresh
  7. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  10. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  12. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  13. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  14. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  16. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  17. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  18. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  19. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  20. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  21. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  22. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  23. 2026-09-02 05:28 UTCOSV refresh
  24. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  25. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  26. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  27. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  28. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  29. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  30. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  31. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  32. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  33. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  34. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  35. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  36. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  37. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  38. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  39. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  40. 2026-08-16 06:52 UTCEG score recompute
  41. 2026-08-16 06:52 UTCVendor advisory
  42. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  43. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  44. 2026-08-14 04:54 UTCEG score recompute
  45. 2026-08-14 04:54 UTCVendor advisory
  46. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  47. 2026-08-12 19:08 UTCEG score recompute
  48. 2026-08-12 19:08 UTCVendor advisory
  49. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  50. 2026-08-11 03:13 UTCEG score recompute
  51. 2026-08-11 03:13 UTCVendor advisory
  52. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  53. 2026-08-10 03:45 UTCEG score recompute
  54. 2026-08-10 03:45 UTCVendor advisory
  55. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  56. 2026-08-09 04:16 UTCEG score recompute
  57. 2026-08-09 04:16 UTCVendor advisory
  58. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  59. 2026-08-07 13:54 UTCEG score recompute
  60. 2026-08-07 13:54 UTCVendor advisory
  61. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  62. 2026-08-05 23:32 UTCEG score recompute
  63. 2026-08-05 23:32 UTCVendor advisory
  64. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  65. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  66. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  67. 2026-08-03 21:46 UTCEG score recompute
  68. 2026-08-03 21:46 UTCVendor advisory
  69. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  70. 2026-08-02 13:31 UTCEG score recompute
  71. 2026-08-02 13:31 UTCVendor advisory
  72. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  73. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 17th percentile

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Frequently asked(5)

What is CVE-2026-33948?
CVE-2026-33948 is a medium-severity vulnerability; its CVE record was published on April 14, 2026. jq is a command-line JSON processor. Commits before 6374ae0bcdfe33a18eb0ae6db28493b1f34a0a5b contain a vulnerability where CLI input parsing allows validation bypass via embedded NUL bytes. When reading JSON from files or stdin, jq uses strlen() to determine buffer length instead of the actual byte…
When was the CVE record for CVE-2026-33948 published?
The CVE record for CVE-2026-33948 was published on April 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-33948 actively exploited?
CVE-2026-33948 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33948?
CVE-2026-33948 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-33948?
A fix for CVE-2026-33948 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33948 are linked in the Vendor Advisories panel on this page.

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