CVE-2026-48487

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 84% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, _read_character_string and _read_string in src/zeroconf/_protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self._data_len, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to send a TXT, HINFO, or A/AAAA record with rdlength=65535 and seed DNSCache and ServiceInfo.properties with truncated, attacker-shaped key/value or address records. This issue is fixed in version 0.149.16.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

Published

June 22, 2026

Last Modified

August 17, 2026

Advisory Details (5)

Auto-updated Jul 17, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)

Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet · Advisory · python-zeroconf/python-zeroconf · GitHub

https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-qc2x-6f54-m6h9
github_release Patch Available

0.149.16

Patch available: python-zeroconf/python-zeroconf 0.149.16

https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.16
github_pr Patch Available

fix: bound record payload reads against rdlength overrun

Patch available: python-zeroconf/python-zeroconf 0.149.13 (PR #1756 merged 2026-05-20)

https://github.com/python-zeroconf/python-zeroconf/pull/1756
generic

Security: `_read_string`/`_read_character_string` skip remaining-byte validation, enabling silent record-data corruption · Issue #1752 · python-zeroconf/python-zeroconf · GitHub

https://github.com/python-zeroconf/python-zeroconf/issues/1752
github_commit Patch Available

commit 544449596e64 (python-zeroconf/python-zeroconf)

Patch available: python-zeroconf/python-zeroconf 0.149.13 (contains commit 544449596e64)

https://github.com/python-zeroconf/python-zeroconf/commit/544449596e645fcaad3834fa0cb614a54f847a82

Vendor Advisories for CVE-2026-48487(1)

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

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-zeroconf0.102.0-1 ... 0.97.0-1 (111 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-zeroconf0.102.0-1 ... 0.97.0-1 (81 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-zeroconf0.147.0-1 ... 0.151.3-1 (15 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-zeroconf0.147.0-1 ... 0.149.9-1 (11 versions)
  • every version up to 0.149.16-1: fixed in 0.149.16-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
zeroconf0.100.0 ... 0.99.0 (259 versions)
  • every version up to 0.149.16: fixed in 0.149.16
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-10-06 15:18 UTCEPSS rescore
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  14. 2026-09-18 11:12 UTCEG score recompute
  15. 2026-09-16 14:08 UTCEPSS rescore
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  18. 2026-09-13 12:29 UTCEG score recompute
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  1. 2026-09-01 13:54 UTCEPSS rescore
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  3. 2026-08-30 20:30 UTCEG score recompute
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  6. 2026-08-28 21:41 UTCEPSS rescore
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  10. 2026-08-24 13:55 UTCEG score recompute
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  20. 2026-08-18 13:48 UTCEPSS rescore
  21. 2026-08-17 20:11 UTCEG score recompute
  22. 2026-08-17 13:47 UTCEPSS rescore
  23. 2026-08-16 20:17 UTCEG score recompute
  24. 2026-08-16 14:56 UTCEPSS rescore
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  26. 2026-08-15 20:52 UTCEG score recompute
  27. 2026-08-15 01:30 UTCEPSS rescore
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  40. 2026-08-06 13:47 UTCEPSS rescore
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  60. 2026-07-26 14:54 UTCEPSS rescore
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  62. 2026-07-25 14:18 UTCEPSS rescore
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  65. 2026-07-23 03:18 UTCEG score recompute▼ 1.20
  66. 2026-07-22 14:08 UTCEPSS rescore
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  71. 2026-07-17 18:34 UTCMITRE cvelistV5CVSS v3 → 5.3 · CVSS v4 → 5.3
  72. 2026-06-22 23:31 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-48487?
CVE-2026-48487 is a medium vulnerability published on June 22, 2026. Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, readcharacterstring and readstring in src/zeroconf/protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self.datalen, allowing unauthenticated hosts on the…
When was CVE-2026-48487 disclosed?
CVE-2026-48487 was first published on June 22, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48487 actively exploited?
CVE-2026-48487 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48487?
CVE-2026-48487 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-48487?
A fix for CVE-2026-48487 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-48487 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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