VulnSocial

CVE-2026-34183Patch(openssl / openssl)

MEDIUMCVSS 7.5 · HIGH

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

  • Patch openssl openssl systems immediately
  • Assume compromise if assets are exposed

Recommended action window: Immediate (within 24h)

NVD description

Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.

openssl CVEsBack to dashboard
4.0/ 10 priority

Sources & remediation

Patch / fix
Vendor / third-party advisories
Weakness type (CWE)
CWE-1325

Priority

MEDIUM

Exploitation

ACTIVE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • openssl

Threat summary

  • Active exploitation appears in 1 classified signals
  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Active exploitation reported across 1 signal
  • Patch or workaround mentioned in 3 signals
  • Technical details provided in 3 signals
  • Peaked 2d ago at 1 mentions (2026-06-11); latest day: 1
  • 3 total mentions across 3 days

Affected systems

Vendors
openssl
Products
openssl

1 version affected across 1 product

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-06-11: 1Mentions · 2026-06-23: 1Mentions · 2026-08-25: 1Active Exploitation · 2026-08-25: 1Patch / Workaround · 2026-06-11: 1Patch / Workaround · 2026-06-23: 1Patch / Workaround · 2026-08-25: 1Technical Details · 2026-06-11: 1Technical Details · 2026-06-23: 1Technical Details · 2026-08-25: 106-1106-2308-25
Signal classification2 categories
Patch
266.7%
Active Exploitation
133.3%
Referenced assets1 URL
Classification over time
DateTotalLabels
2026-06-111
Patch1
2026-06-231
Patch1
2026-08-251
Active Exploitation1
Full discourse3 posts
  • Rahmi Demir ⭐⭐⭐⭐⭐@rahmid3mir
    Patch

    🚨 #GüvenlikBülteni #SiberGüvenlik: QUIC Protokolünde Bellek Tüketimi Kaynaklı DoS Zafiyeti (CVE-2026-34183) Merhaba #Brolyz OpenSSL QUIC yığını içerisinde tespit edilen yeni bir güvenlik zafiyeti, saldırganların hedef sistemleri aşırı bellek tüketimi yoluyla hizmet dışı bırakmasına (DoS) olanak tanıyor. 📌 Ne Oldu? CVE-2026-34183 olarak izlenen bu zafiyet, QUIC protokolündeki PATH_CHALLENGE çerçevelerinin işlenme biçiminden kaynaklanıyor. Uzak bir saldırgan, özel olarak hazırlanmış ağ paketleri göndererek sistemin bellek kaynaklarını tüketebiliyor. ⚠️ Riskler Neler? • Hizmet reddi (DoS) saldırıları • QUIC sunucu/istemci servislerinin çökmesi • Bellek tükenmesine bağlı performans düşüşü • Ağ tabanlı servis sürekliliğinde kesinti Saldırgan, PATH_RESPONSE çerçevelerinin serbest bırakılmasını engelleyerek belleğin sürekli olarak tahsis edilmesini sağlayabiliyor. 🛡️ Alınabilecek Önlemler 1️⃣ OpenSSL ve QUIC bileşenlerini güncel sürümlere yükseltin. 2️⃣ Üretici tarafından yayınlanan güvenlik yamalarını derhal uygulayın. 3️⃣ QUIC trafiği için rate-limiting (trafik sınırlama) politikaları devreye alın. 4️⃣ Ağ izleme sistemlerinde anormal QUIC paket artışlarını takip edin. 📊 Neden Önemli? QUIC, modern internet trafiğinde giderek daha yaygın kullanılan bir protokol olduğu için bu tür bellek tüketimi zafiyetleri, büyük ölçekli servislerde ciddi kesintilere yol açabilir. 🔚 Sonuç Ağ tabanlı DoS saldırıları, doğrudan veri çalmaktan ziyade servis sürekliliğini hedefler. QUIC altyapısı kullanan sistemlerin güncellenmesi ve trafik kontrol mekanizmalarının güçlendirilmesi kritik önem taşır.

    Post summary

    The post discloses CVE‑2026‑34183, a memory‑exhaustion DoS in OpenSSL’s QUIC stack, and urges immediate patching and mitigation steps.

    0001060
    335 followersView on X
  • 𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_irc
    Active Exploitation

    New critical flaws are emerging: MS SharePoint RCE chain (CVE-2026-55040/63520) is actively exploited, threatening data integrity & privacy. IBM Watson Speech Services' QUIC DoS (CVE-2026-34183/3805) impacts real-time comms. Patch now. #Cybersecurity #ZeroDay #DataPrivacy

    Post summary

    The post alerts about actively exploited SharePoint RCE chain and Watson Speech Services DoS vulnerabilities, urging immediate patching.

    0000059
    17 followersView on X
  • Daily Security Review@securitydailyr
    Patch

    OpenSSL patches 16 flaws: CVE-2026-45447, heap use-after-free in PKCS7_verify() with RCE potential via crafted S/MIME. Also: unauthenticated QUIC DoS (CVE-2026-34183) and key forgery (CVE-2026-34182). Check static builds. https://dailysecurityreview.com/resources/openssl-patches-16-flaws-including-heap-use-after-free-rce-risk/ #CyberSecu https://t.co/nC2CFxcNTX

    Post summary

    OpenSSL has patched 16 vulnerabilities, including a heap use‑after‑free that may allow RCE via crafted S/MIME, and two QUIC-related issues; static builds are recommended as a workaround.

    0000045
    118 followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appopensslopenssl---
Appopensslopenssl4.0.0--

Explore more

Back to dashboardopenssl CVEsopenssl vulnerabilities